Free Software :: Network Services

Misc. Network Servers

• NTP ("Network Time Protocol" server. License: BSD-style) (source) (ml) (deb)
• OpenNTPd ("Network Time Protocol" server. License: BSD-style) (source) (public NTP server list)
• HTPd (Hypertext Time Protocol server)
• OpenSLP ("Service Location Protocol" server. SLP allows networking applications to discover the existence, location, and configuration of networked services. License: BSD-style.) (cvs) (ml) (deb)
• E164.org (Directory service of ENUM telephone numbers that can be reached over the Internet.)
• Rivendell (Qt/MySQL based radio broadcast automation system, with support for ALSA and AudioScience HPI)
• Wsh (Web shell. Perl/CGI based remote shell system, with support for HTTPS.)
• CIA (Python/Twisted based system for tracking open source projects in real-time) (svn)
• PyGopherD (Python based Gopher daemon) (deb)
• BananaPOS (GTK+ and MySQL based point-of-sale client/server system, together with a web based administration interface)
• ndtpd (Server for accessing CD-ROM books via the Network Dictionary Transfer Protocol) (ml)
• IPoCAN (GNU/Linux specific IP over CAN networking system) (cvs)
• Uptimed (Daemon keeping track of the highest uptimes a computer system ever had) (deb)
• Cwdaemon (UDP based Morse code transmitter which uses the parallel port and a custom made transistor switch)

Routing & Whois Servers

• Quagga (IPv4/IPv6 routing server for BGPv4, RIPv1/2 and OSPFv2. Quagga is a code-fork of the inactive Zebra project.) (cvs) (ml) (deb)
• Zebra (IPv4/IPv6 routing server for BGPv4, RIPv1/2 and OSPFv2. Inactive project.) (ml) (deb)
• OpenBGPD (BGPv4 routing server. License: BSD-style) (cvs)
• XORP ("eXtensible Open Router Platform". IPv4/IPv6 routing server. License: BSD-style) (cvs) (ml)
• SRRD ("Service Routing Redundancy Daemon") (ml)
• Unik OLSR ("Optimized Link State Routing Protocol" routing daemon implementation) (ml)
• BIRD (IPv4/IPv6 routing server for BGPv4, RIPv1/2 and OSPFv2) (deb)
• IRRd ("Internet Routing Registry database" server with support for the RPSL routing registry syntax. License: BSD-style) (ml)
• RIPE Whois server (License: BSD-style)

Routing & Whois Clients

• Whois (Whois client by Marco d'Itri. It is less complex than the RIPE client, and is part of Debian, SuSe, Mandrake, and other GNU/Linux distributions.)
• gwhois (gwhois can also be used as a whois server by using something like 'inetd')
• RIPE Whois (License: BSD-style)
• RIPE (Whois web interface for Europe)
• ARIN (Whois web interface for the USA)
• APNIC (Whois web interface for Asia)

Wireless Network Servers

• Pebble (Debian GNU/Linux variant for 'embedded' 802.11b wireless devices. Pebble is designed to fit on a 128 MB flash card.) (ml)
• LEAF ("Linux Embedded Appliance Firewall". GNU/Linux variant for embedded network appliances. LEAF has support for 802.11b wireless networking.) (cvs) (ml)
• NoCatAuth (Perl based authentication server for an open wireless access point) (ml)
• NoCatSplash (C based authentication server for an open wireless access point) (ml)
• NodeDB (Portal which registers publicly accessible 802.11b wireless networking nodes around the world)
• LWS LAN Project ("Linux Wireless Sensor LAN Project". Linux drivers and utility set for creating a 802.15.4 based low-rate wireless personal area network) (cvs) (ml)
• OpenGGSN ("Open Gateway GPRS Support Node". OpenGGSN consists of a GTP library, a SGSN emulator, and a GGSN application) (cvs) (ml) (deb)
• DHARMA ("Distributed Home Agent for Robust Mobile Access". Python/Twisted based mobile network connectivity service.) (ml)
• RadioActive (RFID software suite. License: Apache License v2) (ml) (Neutrino global data exchange project) (Fusion EPC management middleware) (Graviton RFID hardware simulator)

Wireless Network Clients

• Open1x (802.1x network client supporting EAP/TLS authentication) (cvs) (ml)
• wlandetect (Perl based 802.1x network discovery tool)
• waproamd (802.1x network discovery tool)
• WifiScanner (802.1x network discovery tool) (cvs) (ml)
• WiFi Radar (Python/GTK+ based 802.1x network discovery tool)
• AirFart (GTK+ based 802.1x network client for detecting wireless devices, calculate their signal strengths, and report them to the user) (cvs)
• aeswepd (802.1x network tool for changing WEP keys of WLAN devices in constant intervals, to strengthens the security of the weak hardware based, standards compliant WEP technology.)
• ap-utils (SNMP tools for configuring and monitoring wireless access points) (ml) (deb)
• KWiFiManager (KDE based wireless network-card management tool) (cvs) (ml)
• Kifi (KDE based wireless network-card management tool) (forum)
• KWirelessMonitor (KDE based wireless network-card management tool)
• KNemo (KDE based wireless network-card management tool)
• KWlanInfo (KDE based wireless network-card management tool)

SNMP Servers

• Net-SNMP (Client and server software for SNMP based network device management. License: BSD-style) (cvs) (ml) (deb)

SNMP Clients

• Net-SNMP (Client and server software for SNMP based network device management. License: BSD-style) (cvs) (ml) (deb)
• Braa (SNMP query tool)
• SNMPTT ("SNMP Trap Translator". Perl/Net-SNMP based SNMP trap tool, which can send output to: standard output, a text log file, syslog or a RDBMS. SNMRTT can also execute a user-defined program when a trap is received.) (cvs) (ml)
• LooperNG (Perl based SNMP monitoring tool) (cvs) (ml)
• SNMPMonitor (Qt/Net-SNMP based SNMP monitoring tool)
• Mbrowse (GTK+/Net-SNMP based SNMP MIB browser tool) (ml) (deb)
• ap-utils (SNMP tools for configuring and monitoring wireless access points) (ml) (deb)

DNS Servers

• NSD (Authoritive-only DNS server) (ml) (deb)
• BIND (Authoritive and recursive/caching DNS server. License: BSD-style) (ml) (deb) (wp)
• ldapdns (Authoritive-only DNS server which retrieves DNS data directly from a LDAP directory) (ml) (cvs) (deb)
• pdns (Recursive/caching-only DNS server) (maintenance page) (deb)
• Dnsmasq (Forwarding/caching-only DNS server) (deb)
• MyDNS (Authoritive-only DNS server which retrieves DNS data from a MySQL database) (ml) (deb)
• PowerDNS (Authoritive-only DNS server which can retrieve DNS data from various RDBMS or Bind zone files) (ml) (poweradmin PHP based management tool for PowerDNS)
• Posadis (Authoritive and proxying DNS server) (cvs) (ml) (forum)
• MaraDNS (Authoritive and recursive/caching DNS server. License: BSD-style) (source code) (ml) (deb)
• Oak (Python based authoritive and recursive DNS server)

DNS Clients

• hostupd (Perl based dynamic DNS client)
• FireDNS (A non-blocking DNS stub resolver library) (deb)
• adns (A non-blocking DNS stub resolver library and a collection off DNS resolving utilities) (deb)
• RULI ("Resolver User Layer Interface". A non-blocking DNS stub resolver library for resolving DNS SRV resource records.) (ml) (deb)

DHCP Servers

• uDHCP (Lightweight DHCP server and client) (cvs) (ml) (deb)
• ISC DHCP (DHCP server, client and relay reference-implementation. License: BSD-style) (ml) (deb)
• DHCPv6 (IPv6 based DHCP server and client implementation. License: BSD-style) (cvs) (ml)
• dhcp-forwarder (Forwards DHCP messages between subnets with different sublayer broadcast domains)

DHCP Clients

• uDHCP (Lightweight DHCP server and client) (cvs) (ml) (deb)
• DHCPd (DHCP client)
• Pump (DHCP client) (deb)
• ISC DHCP (DHCP server, client and relay reference-implementation. License: BSD-style) (deb)
• DHCPv6 (IPv6 based DHCP server and client implmentation. License: BSD-style) (cvs) (ml)

LDAP Servers

• OpenLDAP (LDAP server and tools. License: BSD-style) (cvs) (ml) (deb) (M$ w32 port) (UltraPossum OpenLDAP monitoring and configuration framework)
• Fedora Directory Server (LDAP server and tools. License: server: GPL+Exception, client library: MPL/LGPL/GPL) (ml)
• TinyLDAP (Lightweight LDAP server and client. Inactive project.)

LDAP Clients

• GQ (GTK+ based LDAP administration tool) (cvs) (ml) (deb)
• phpLDAPadmin (PHP based LDAP administration tool) (cvs) (ml) (deb)
• LDAP Explorer (PHP based LDAP administration tool) (cvs)
• LDAPExplorerTool (wxWindows based LDAP administration tool. License: BSD-style) (cvs) (ml) (deb)
• ldapvi (Tool for editing LDAP entries with a text editor using an LDIF-like format) (deb)
• led (Perl based, general-purpose, LDAP editor which allows editing of LDIF data using any text editor. License: BSD-style)
• VLAD (Ncurses based LDAP directory tree visualization tool) (deb)
• Web2LDAP (Python/Web based LDAP administration tool. Runs as a FastCGI script or as a standalone web server)
• LDAPweb (PHP based LDAP administration tool) (cvs)
• Luma (Python/Qt based LDAP administration tool) (cvs) (ml)
• LDAP Migration Tools (Perl scripts for migrating user accounts, group accounts, email aliases, and other system information to LDAP) (cvs) (ml) (deb)
• DirAdmin (GNOME based LDAP administration tool)
• KDirAdmin (KDE based LDAP administration tool)
• LDAPsh (Perl based LDAP administration shell environment) (cvs) (ml)
• LMS ("LDAP Management System". PHP based framework for doing LDAP directory based network administration.)
• LDAPview (Perl/CGI based framework for doing LDAP directory based network administration. Alpha status.)
• LABE (PHP based web application to manage an addressbook)
• adtool (Set of Un*x console tools for managing user accounts stored in M$ "Active Directory")
• LDAPfs (LDAPfs allows LDAP entries to be read and written using the familiar filesystem interface. LDAPfs requires the AVFS/FUSE or Coda filesystem.) (cvs)

GPS Clients

• GPS Tools (from the Science section)

Communication Servers

- Groupware Servers

• Web Groupware (from the Business Software section)

- SMTP Servers

• PostFix (SMTP server with a focus on security. License: IBM Public License) (ml) (deb)
• Courier (Integrated mail platform, including a SMTP, IMAP, POP3 and webmail server.) (cvs) (ml) (deb)
• Exim (Simple SMTP server) (ml) (deb)
• ZMailer (SMTP server aimed at large sites) (cvs) (ml) (deb)
• MasqMail (SMTP server for hosts that do not have a permanent internet connection or have changing ISP connections) (deb)
• qpsmtpd (Perl based SMTP server) (cvs) (ml)
• msmtp (SMTP message submission agent for MUA's, is an alternative for the '/usr/sbin/sendmail' command.)

- IMAP/POP3 Servers

• DBMail (POP3/IMAP server which stores mail messages in a RDBMS.) (cvs) (ml)
• Cyrus (IMAP server. License: BSD-style) (ml) (deb)
• Courier (Integrated mail platform, including a SMTP, IMAP, POP3 and webmail server.) (cvs) (ml) (deb)
• UW-IMAP (University of Washington IMAP server) (ml) (deb)
• Dovecot (IMAP server with a focus on security) (ml) (deb)
• Binc IMAP (IMAP server) (deb)
• Solid-POP3 (POP3 server) (deb)
• tpop3d (POP3 server) (ml)
• zpop3d (POP3 server)
• Qpopper (POP3 server. License: BSD-style)
• PowerMail (SMTP and POP3 server system which uses a RDBMS for all information about mailboxes and email forwards) (ml)
• Perdition (IMAP/POP3 proxy server) (cvs) (ml) (deb)
• IMAP Proxy (IMAP proxy server)

- NNTP Servers

• Noffle (NNTP server) (cvs) (ml) (deb)
• NewsCache (NNTP server. Inactive project.)

- IRC/IM Servers

• Jabber (Modular XML-based instant messaging client/server system. See also: XMPP. License: JOSL) (cvs) (ml) (wp) (blog) (deb) (jabberstudio.org Jabber project development portal)
• Dancer IRCd (IRC server) (cvs) (deb)
• ngIRCd (IRC server) (cvs)
• IRCu (IRC server) (cvs)
• SILC (Secure Internet Live Conferencing. IRC-alike system.) (cvs) (ml)
• Say2 (IRC-alike system) (cvs) (ml)
• dircproxy (IRC proxy server. Dircproxy keeps you connected to the IRC server, even after you detach your client from it.) (cvs) (deb)
• OpenRTC (Open Remote Collaboration Tool. Flexible client/server communication system that supports synchronous and/or asynchronous communication between.) (cvs) (ml)

- Calendaring and Scheduling Servers

• libical (Implementation of IETF's iCalendar calendaring and scheduling protocols) (cvs) (ml)

- Telecom Servers

• Farsight (Gstreamer based audio/video conferencing framework for Instant-Messaging clients) (cvs) (ml)
• Asterisk (Multiprotocol PBX toolkit) (ml) (blog)
• GNU Telephony (Telecommunications application server) (cvs) (ml)
• Yate ("Yet Another Telephony Engine". Telecommunications application server.) (cvs)
• Caivar (Portable interactive voice response (IVR) system based on CAPI. Caivar supports: text-to-speech, 'barge in', 3 party conferencing and G3 fax. Caivar has several language binding API's for the creation of telephony applications, like e.g.: voice-boxes, authentication systems, and automatic callcenters.)
• HylaFAX (Server and client software for sending and receiving facsimiles as well as for sending alpha-numeric pages. License: BSD-style) (cvs) (ml)
• Kannel (WAP and SMS gateway server. License: BSD-style) (cvs) (ml)
• BlueLava (Perl/CGI script to control WAP and x10 devices via a web interface)

- VoIP Servers

• SIPfoundry.org (SIP community site for the promotion and development of SIP software) (ml)
• OpenH323 (Implementation of the ITU H.323 teleconferencing protocol) (cvs) (ml) (Gatekeeper management tool for H.323 clients)
• Vocal (VOIP application development framework, with support for: H.323, SIP, CDR, MGCP) (ml)
• partysip (SIP proxy)
• Siproxd (SIP Proxy) (ml)

Communication Clients

- Email/Groupware Clients (not web based)

• Mutt (Console based Mailbox/Maildir/POP3/IMAP supporting mail client) (ml) (Mutt sidebar folder-list side-bar patch) (Muttprint pretty printing of emails using LaTeX) (MailtoMutt mailto URL handler) (cvs)
• KMail (KDE based email client) (ml) (deb)
• Mozilla Thunderbird (Mozilla based IMAP4, POP3 mail client) (forum) (wp) (deb)
• Evolution (GNOME based messaging/groupware environment) (ml) (wp) (deb) (Noodle OpenGrouware integration improvement project)
• Balsa (GNOME based IMAP4, POP3 mail client) (ml) (deb)
• Aethera (KDE based messaging/groupware environment) (deb)
• Sylpheed (GTK+ based IMAP4, POP3, NNTP client) (deb)
• offlineimap (Tool to read and manage your IMAP-accessible mail offline on multiple computers)
• Mahogany (GTK+ based IMAP4, POP3, NNTP client. Inactive project.) (deb)
• Nail (Console based mail client derived from the Berkeley Mail tool. License: BSD-style) (cvs) (ml)

- Web based Email/Groupware Clients

• SquirrelMail (PHP based IMAP webmail client) (cvs) (ml) (deb)
• IMP (PHP based IMAP/POP3 webmail client for the Horde web application platform) (cvs) (ml) (deb)
• Aeromys (PHP based webmail)
• cgiPop (C/CGI based POP3 webmail client)
• SqWebMail (Maildir mailbox format based webmail client. Sqwebmail is part of the Courier Mail suite.)

- NNTP Clients

• Pan (GNOME based NNTP client) (ml)
• Slrn (Slang console GUI based NNTP client) (ml)
• TIN (Ncurses console GUI based NNTP client)
• nget (Command-line NNTP file grabber) (cvs)

- IRC/IM Clients

• Jabber (Modular XML-based instant messaging client/server system. License: JOSL) (cvs) (ml) (wp) (deb) (jabberstudio.org Jabber project development portal)
• Punjab (Python based HTTP Jabber client interface) (cvs) (ml)
• Kopete (IRC/IM client) (cvs) (ml)
• Psi (Qt based IM client) (cvs) (forums)
• Everybody (GTK+ based IM client) (ml)
• Gaim (GTK+ based IM client) (cvs) (ml)
• Gajim (GNOME based IM client)
• Centericq (Ncurses based IM client)
• Coccinella (Tcl/Tk based IM client with a multimedia whiteboard)
• Licq (Qt based IM client for the ICQ protocol) (cvs) (ml)
• TMSNC (Ncurses based MSN IM client. License: BSD-style)
• AMSN (TCL based IM client) (cvs) (ml)
• Xchat (GNOME based IRC client) (cvs) (forum)
• xchat-gnome (GNOME based IRC client. Code-fork of Xchat fork, with a focus on usability.) (svn)
• Konversation (KDE based IRC Client) (cvs) (ml)
• Irssi (Console based, IRC client) (ml)
• BitchX (Console based IRC client)
• CGI:IRC (Perl/CGI based IRC client usable from a frames-capable webbrowser)
• Silky (GTK+ based SILC client) (cvs)

- Telecom Clients

• SIPfoundry.org (SIP community site for the promotion and development of SIP software) (ml)
• g-page (Server and GTK+ client to send out SMS messages. Protocols supported: SNPP, WCTP and SMTP.) (cvs) (ml)
• GNU HaliFAX (Fax software for viewing and printing facsimiles)
• eFax GTK+ (GTK+ based front-end fo the 'efax' fax sending/receiving program)
• smssend (Console tool for sending SMS messages) (FlexMS Qt based GUI for smssend)
• Gnokii (GTK+ based tools and user-space drivers for Nokia mobile phones) (cvs) (deb)
• Gammu ("GNU All Mobile Management Utilities". Code fork of GNokii.)

- VoIP Clients

• Jabbin (Qt based Jabber client with VoIP support)
• Tapioca (GNOME based SIP/Jabber client) (svn) (ml)
• GnomeMeeting (GNOME based H.232 compatible client) (ml)
• Minisip (Qt based SIP client)
• KCall (KDE based SIP client)

Social Network Systems

• FoaF Project (Initiative to create a network of machine-readable documents describing people, the links between them. See also the FOAF Vocabulary 0.1 specification.)
• foaf_tools (Bash scripts for manipulating and generating FOAF RDF files)
• FoaF Explorer (? based FoaF browser)
• Slashster (PHP based FoaF browser) (cvs)
• FOAF-a-Matic (Javascript script to create a FoaF file from a web-form)
• LoaF (Perl script based email handling extension, to share your address book without abandoning your privacy)

File Transfer Servers (excl. HTTP servers)

• Samba (Server that can provides shared file and print services to SMB/CIFS clients) (cvs) (ml) (wp) (deb)
• Lsh (Secure Shell v2 implementation) (cvs) (ml) (wp) (deb)
• OpenSSH (Secure Shell v1/v2 implementation. License: BSD-style) (cvs) (ml) (wp) (deb) (Keychain RSA/DSA key management tool) (ldappubkey patch for LDAP based public-key lookups) (Kerberos/GSS-API patch for authenticating users via their Kerberos credentials)
• Dropbear (Secure Shell v2 implementation, based on OpenSSH and Putty. License: BSD-style)
• ProFTPD (FTP server) (ml)
• vsftpd (FTP server)
• twoftpd (FTP server)
• PureFTP (FTP server) (cvs)
• BSDftpd-ssl (FTP server. License: BSD-style)
• wzdftpd (FTP server)
• moftpd (FTP server) (ml)
• uTFTPd (TFTP server with fine-grained access control, support for blksize (RFC 2348), timeout options, and support for revision control.)
• atftp (TFTP server) (deb)
• PFTP (Port-File-Transfer-Program. High-performance host-to-host file transfer program using the telnet protocol.) (deb)
• UDPcast (File transfer tool which can send data simultaneously to many destinations on a local network at once) (ml) (deb)
• teepeedee (HTTP/FTP based file server)

File Transfer Clients (excl. HTTP clients)

• gFTP (GNOME based FTP client) (ml) (deb)
• KBear (KDE based FTP client) (cvs) (ml) (deb)
• Kasablanca (KDE based FTP client) (cvs) (forum)
• ftpcopy (Command-line FTP client, optimized for mirroring FTP sites)
• lftp (Command-line file-transfer client, supported protocols: FTP, HTTP, SFTP, and Fish) (deb)
• wput (Command-line FTP file upload client)
• net2ftp (PHP/Web based FTP client)
• Drall (Perl/CGI script which allows users to access their directories and files remotely through a web browser) (cvs)

HTTP Servers

• Apache HTTPd (Very popular, modular and feature-rich HTTP server. License: BSD-style) (cvs) (ml) (blog) (wp) (deb) (apache-tools Collection of monitoring and log-analysis tools) (mod_perl book)
• Boa (Small HTTP server with CGI support) (ml) (deb) (Hydra Boa code-fork with TLS support via GNU TLS)
• Thy (Small HTTP server) (deb)
• thttpd (Small HTTP server with CGI and bandwidth-throttling support. License: BSD-style) (deb)
• rws (Richards Web Server. Small HTTP server with CGI support.)
• AppWeb (Small HTTP server with CGI support, server side JavaScript) (forum)
• yhttpd (Small, C++ based, HTTP server with CGI support.) (cvs)
• bozohttpd (Small HTTP server with CGI support. License: BSD-style) (deb)
• AWHTTPD ("Anti-Web HTTPD". Small HTTP server with CGI support.) (deb)
• gatling (Small HTTP server with CGI support)
• fnord (Small HTTP server with CGI support, and requires the non-free tcpserver package)
• Monkeyd (Small HTTP server)
• Cherokee (Small HTTP server) (ml)
• MyServer (Small HTTP server with CGI support) (cvs) (ml)
• Tux (Kernel-space HTTP server)
• Roxen (HTTP server with loadable modules support) (cvs) (deb)

HTTP Clients

- Console Web Browsers

• Links (Ncurses based web browser which aims for simplicity) (ml)
• ELinks (Ncurses based web browser with many features. ELinks was based upon the Links project and aims to included more features.) (ml)
• Twibright Links (Ncurses based web browser with image support. Twibright Links was based upon the Links project.)
• w3m (Console web browser, with support for: tables, frames, https, cookies and more)
• Lynx (Simple console web browser)
• Retawq (Ncurses based console web browser, with support for: multiple/split windows, tables, frames, https, and more)
• Netrik (Ncurses based web browser) (cvs) (ml)

- Graphical Web Browsers

• Konqueror (KDE based file & web browser) (cvs) (ml) (wp) (KHTML.info)
• Mozilla (Standards compliant, portable, self-contained web browser and web development framework) (lxr) (ml) (blog) (blog2) (wp) (Mozdev Portal for Mozilla based projects) (Mozillazine Mozilla news) (MozillaNews Mozilla news) (deb)
• Mozilla Firefox (Mozilla based web browser) (forum) (spreadfirefox.com promotional site) (wp) (deb)
• Epiphany (Mozilla Gecko-engine based web browser, with a focus on GNOME integration.) (ml) (wp) (deb)
• Galeon (GNOME and Mozilla Gecko engine based web browser) (cvs) (ml) (deb) (wp)
• Kazehakase (GTK+ and Mozilla Gecko engine based web browser) (cvs) (ml)
• K-Meleon (Mozilla Gecko engine based web browser for M$ w32 platforms) (cvs) (ml)
• Dillo (Lightweight GTK+ based web browser) (cvs) (ml) (wp)

- Web Crawlers, & Archivers

• OpenFTS ("Open Source Full Text Search". PostgreSQL based search engine that provides online indexing of data and relevance ranking for database searching. (cvs) (ml) (forum)
• Swish-E ("Simple Web Indexing System for Humans". Web indexing and searching system.) (cvs) (ml)
• Swish++ ("Simple Web Indexing System for Humans". C++ based rewrite of Swish-E.)
• ht://Dig (Web indexing and searching system for a domain or intranet) (cvs) (ml)
• Heritrix (Web crawling client used by the Internet Archive project) (cvs) (ml)
• Hyper Estraier (Full-text indexing and search system) (ml)
• Estraier (Full-text indexing and search system)
• Senga (Initiative to build a large scale, component based, Internet search engine. Inactive project.) (cvs) (ml)

- Web Retrieval Clients

• Wget (Command-line web retrieval tool) (ml)
• cURL (Command-line web retrieval tool based on a multiprotocol file transfer library called libcurl. License: BSD-style.) (cvs) (ml)
• HTTrack (Off-line web browser) (forum) (KHTTrack KDE GUI based version)

- RSS Clients

• aKregator (KDE based RSS client) (cvs)
• Raggle (Ruby/Ncurses based RSS client) (ml)
• Syndigator (GTK+ based RSS client) (cvs) (ml)
• PenguinTV (GNOME based RSS client optimized for multimedia content) (cvs)
• Straw (Python/GNOME based RSS client) (cvs) (ml)
• MyRSS (Python based RSS client which ouputs HTML. Inactive project.) (cvs)
• newsbeuter (Console based RSS feed reader)
• Redfoot (Python/RDFLib based RDF tool. License: BSD-style)
• Gregarius (PHP based RSS client) (svn) (ml)
• Lilina (PHP based RSS client) (cvs)
• zFeeder (PHP based RSS client) (forum)
• TV RSS (GTK+ based RSS client for bittorrent files)
• RSS.NET (C# based RSS retrieval library) (cvs)
• Atom.NET (C# based Atom-RSS retrieval library) (cvs)

- Web Checker Clients

• LinkChecker (Python based web link checker) (cvs)
• checkbot (Perl based web link checker)
• websec (Web Secretary. Perl based web site change checker) (cvs) (ml)
• gURLChecker (GNOME based web link checker) (cvs) (ml)

HTTP Application Servers

• See: Web Application Frameworks

HTTP Proxy Servers

• Squid (Advanced web content caching and filtering proxy) (cvs) (ml) (experimental squid projects)
• TinyProxy (Lightweight HTTP/S proxy) (cvs) (ml)
• Privoxy (Web content filtering proxy) (cvs) (ml)
• Oops! (Web content caching and filtering proxy) (ml)
• MiddleMan (Filtering HTTP/S proxy server) (cvs)
• WebCleaner (Python based filtering HTTP proxy server with a FOX GUI configuration frontend) (cvs)
• Pound (Reverse-proxy and load-balancer for HTTP/S traffic)
• BFilter (Web content filtering proxy) (cvs)
• Epoxy (Web content caching proxy)
• ffproxy (Web content filtering proxy)

HTTP Proxy Clients

• prtunnel (Tunnel TCP connections through an HTTP or SOCKS5 proxy) (forum)
• desproxy (Tunnel TCP connections through an HTTP or SOCKSv4/5 proxy. Desproxy also supports DNS UDP/TCP forwarding.)
• Firepass (Perl script to tunnel TCP or UDP connections through an HTTP proxy)
• connect-tunnel (Perl script to tunnel TCP connections through an HTTP proxy)

Key Management Systems

• GnuPG (OpenPGP implementation, used for signing and encrypting documents) (cvs) (ml) (Seahorse (GNOME based front-end for GnuPG) (WinPT M$ w32 GnuPG interfaces, such as for GnuPG plugins for the Outlo*k and Eud*ra email clients) (pgpdump PGP packet visualizer which displays the packet format of OpenPGP data)
• OpenPKSD Keyserver (Ruby/PostgreSQL based OpenPGP compatible public key server software) (source)
• CryptNET Keyserver (Ruby/PostgreSQL OpenPGP compatible public key server software. Inactive project.) (cvs) (ml)
• OpenCA (Certification Authority framework. License: BSD-style)
• Smart Sign (Framework for smartcard based authentication)
• webSSL (Perl/CGI based OpenSSL frontend. WebSSL can be used to setup your own certification authority authority and issue SSL and user certificates)
• XCA (Qt based tool to manage a small certification authority)
• IDX-PKI (Management software for public key infrastructures based on the PKIX recommendations. Inactive project.)
• TinyCA (Perl/Tk based GUI to manage a small certification authority)
• CA Cert (Project to help provide free client certificates and -maybe at a low cost- checked server certificates)
• Keychain (RSA/DSA key management for the OpenSSH secure shell implementation)
• Keyring for PalmOS (Tool for the secure storing of sensitive data on the Palm*S) (cvs) (ml)

Encryption & Authentication Servers

• OpenID (Simple URL based identity system) (ml)
• Pubcookie (Web authentication server for single sign-on authentication for websites throughout an institution. License: Apache v2 License) (cvs) (ml)
• Lasso (Implementation of the Liberty Alliance standards. Lasso allows for federated identity databases and single sign-on.) (cvs) (ml) (Authentic Identity server based on Lasso and the Apache/Quixote web application server) (ml)
• XUP ("XML User Profiles". XML format for exchanging and distributing user profiles.)
• PAM ("Pluggable Authentication Modules". Flexible framework for user authentication on Un*x-like systems.) (cvs) (ml) (modules) (PAM X509 PAM module which will authenticate user by X509 certificates) (pam_ldap PAM module to authenticate users via a LDAP directory, and to let them change their passwords in the directory) (pam_krb5 PAM module for Kerberos v5 based password checking) (cvs) (ml)
• Lsh (Secure Shell v2 client/server implementation) (cvs) (ml)
• OpenSSH (Secure Shell v1/v2 client/server implementation. License: BSD-style) (cvs) (ml) (wp) (deb) (Keychain RSA/DSA key management tool) (ldappubkey patch for LDAP based public-key lookups) (Kerberos/GSSAPI patch for authenticating users via their Kerberos credentials)
• Dropbear (Secure Shell v2 server implementation, based on OpenSSH and Putty. License: BSD-style)
• GnuTLS (TLS library) (cvs) (ml)
• MatrixSSL (TLS library) (ml)
• OpenSSL (TLS library. License: BSD-style with anti-license-mixture clause) (cvs) (ml)
• GNU SASL (SASL implementation) (cvs)
• Cyrus SASL (SASL implementation) (cvs) (ml)
• Shushi (implementation of the RFC 1510, the Kerberos network authentication system. Shushi can be used to authenticate users in distributed systems. (cvs)
• GSS Generic Security Service. GSS-API v2 implementation which makes use of the Sushi library.) (cvs)
• autossh (Secure shell utility to start a copy of ssh and monitor it, restarting it as necessary should it die or stop passing traffic. License: BSD-style)
• SSLwrap (Wrap TCP services with TLS/SSL transport encryption)
• Stunnel (Wrap TCP services with TLS/SSL transport encryption) (ml)
• KAME (IPv6/IPsec networking stack implementation. License: BSD-style) (cvs)
• Openswan (IPsec implementation. Code-fork of FreeS/WAN.) (ml)
• FreeS/WAN (IPsec implementation. Inactive project.) (ml)
• OpenVPN (VPN solution) (cvs) (ml)
• VTun (VPN solution) (cvs) (ml)
• Amrita VPN (VPN solution) (cvs)
• Tinc (VPN solution. Inactive project.) (ml)
• CIPE (Crypto IP Encapsulation. VPN solution. Inactive project.) (ml)
• VPNd (VPN solution. Inactive project.)
• FreeRADIUS (Radius authentification server) (ml) (LDAP patch) (Cistron Radius The ancestor project of FreeRadius)
• OpenRadius (Radius authentification server) (ml)
• Macs (Modular Access Control System. System for global authentication, authorization, user/group/resource management, and application services.) (cvs) (ml)

Encryption & Authentification Clients

• Lsh (Secure Shell v2 client/server implementation) (cvs) (ml)
• GnuTLS library (TLS library) (cvs) (ml)
• OpenSSH (Secure Shell v1/v2 client/server implementation. License: BSD-style) (cvs) (ml) (wp) (deb) (Keychain RSA/DSA key management tool) (ldappubkey patch for LDAP based public-key lookups) (Kerberos/GSSAPI patch for authenticating users via their Kerberos credentials)
• OpenSSL (TLS library. License: BSD-style with anti-license-mixture clause) (cvs) (ml)
• SecPanel (Tcl/Tk based secure shell client)
• PuTTY (M$ w32 secure shell client including a terminal emulator. License: BSD-style)
• Publimark (Steganography tool for embedding text in an audio file)
• Stego (Steganography tool for embedding text in a BMP file)

Printing Systems

• LinuxPrinting.org (Un*x printing information portal) (ml)
• CUPS (Common Un*x Printing System. An Internet Printing Protocol implementation.) (ml) (wp)
• LPRng (Re-implementation of the Berkeley LPR print spooler interface)
• PPR (Print spooler for PostScript printers. License: BSD-style) (cvs) (ml)

Peer to Peer Systems

- BitTorrent Search Portals

• bittorrent.com
• yotoshi.com

- BitTorrent Clients

• BitTorrent (Peer-to-peer system for distributing large files. BitTorrent includes a wxWidgets based client GUI. License: BSD-style) (ml) (wp)
• LibTorrent (C++ based BitTorrent library. LibTorrent includes a ncurses based Bittorrent client.) (cvs) (ml)
• BitTornado (Console based BitTorrent client) (forums)
• ABC ("A BitTorrent Client". wxWidgets based based BitTorrent client, based on the BitTornado client. License: Python Software Foundation License) (forum)
• BTQueue (Console based BitTorrent client based on the BitTornado client. License: Python Software Foundation License) (cvs) (forum)
• Blog Torrent (Python/PHP based BitTorrent client and tracker) (cvs) (forums)
• TorrentFlux (PHP based BitTorrent client) (forums)

- BitTorrent Trackers and Tools

• PHPBTTracker-Admin (PHP based BitTorrent tracker) (forum)
• trackerbt (Distributed BitTorrent tracker)
• ByteMonsoon (PHP/MySQL based BitTorrent tracker) (ml)
• GTorrentViewer (GTK+ based BitTorrent file editor and viewer)
• TorrentSpy (M$ w32-only tool which reports status information on a BitTorrent torrent file. License: BSD-style.) (cvs) (forum)
• TorrentSniff (Perl script which reports status information on a BitTorrent torrent file. TorrentSniff is a code-fork of TorrentSpy. License: BSD-style.)

- Other P2P Systems

• MLDonkey (Peer-to-peer system, including a web and GTK+ based client for several P2P networks) (cvs) (ml) (community site) (wp) (KMLDonkey KDE based GUI for mldonkey) (cvs) (ml)
• xMule (Peer-to-peer system, including a web and WxWindows based client for the eDonkey network. xMule is a port of the eMule client to Un*x.) (cvs) (forums)
• aMule (Peer-to-peer system, including a web and WxWindows based client for the eDonkey network. xMule code fork.) (forums)
• eMule (M$ w32 only peer-to-peer client for the eDonkey network) (forums)
• Qtella (QT based Gnutella client) (cvs) (ml)
• GTK-Gnutella (GTK+ based Gnutella client) (cvs) (ml)
• PeerCast (Gnutella protocol based peer-to-peer audio streaming system with support for Ogg Vorbis) (forum)
• Streamer (Peer-to-peer based audio streaming system) (forum)
• Jabber (Modular XML-based instant messaging client/server system. License: JOSL) (cvs) (ml) (blog) (IM blog) (wp) (deb)
• GNUnet (Peer-to-peer system with a focus on security & privacy. Alpha status.) (ml)
• Gnut (Console based Gnutella client)
• Mutella (Console and web based Gnutella client) (cvs) (ml)
• Gnucleus (Gnutella client for M$ Windows) (cvs)
• Squall (Peer-to-peer system for distributing file system directory hierarchies) (svn) (ml) (forum) (libpdpt client library for PDTP) (svn) (ml)
• OpenAG (Free Un*x implementation of the Audi*galaxy/v520L protocol. Inactive project.) (cvs) (ml)

Thin Client Systems

• Etherboot (Toolset for creating ethernet card ROM images that can do a network bootstrap) (cvs) (ml)
• Netboot (Allows a diskless, but networked, PC to boot an operating system via NFS or ramdisk) (cvs)
• Nilo ("Network Interface Loader". Combination package of the Etherboot and Netboot project. Inactive project.) (cvs)
• LTSP ("Linux Terminal Server Project". Collection of server software to setup a console or X based thin-client environment.) (ml) (LTSP-MOSIX framework for using MOSIX in a LTSP network) (ml)
• Thinstation (GNU/Linux based thin-client distribution, with support for a variety of thin-client protocols) (ml)
• PXES (GNU/Linux based thin-client distribution, with support for a variety of thin-client protocols) (forums)
• Plume (Debian GNU/Linux based toolset for creating and administering a network of diskless computers used as X terminals) (cvs) (ml)
• lessdisks (Debian GNU/Linux based toolset for creating and administering a network of diskless computers used as X terminals) (ml)

Remote Desktop Systems

• NX (X display protocol compression toolset. License: BSD-style) (ml) (FreeNX thin-client server based on the NX toolset)
• VNC (Virtual Network Computing. Remote 'desktop' display system. The VNC client and server software is available for many different platforms.) (ml) (AT&T VNC original VNC site) (TightVNC slow-link VNC version) (ml) (uVNC VNC version for 8-bit microcontrollers) (libVNCServer C based library for writing VNC server applications) (cvs)
• rdesktop (Un*x client for accessing a M$ Windows 'Terminal Server' using the RDP protocol. No server extensions are required.) (cvs) (ml) (tsclient (GNOME based rdesktop frontend)
• Synergy (Portable system for sharing a single mouse and keyboard, between multiple computers, without special hardware) (cvs) (forum)

Distributed Computing Systems

• OSCAR ("Open Source Cluster Application Resource". Integrated software collection for building, programming, and using computer clusters.) (cvs) (ml)
• lvs-kiss (Perl based daemon for dynamic load balancing and failover of network services. Inactive project.) (cvs) (ml)