JonDesign's SmoothGallery
- Using mootools, this javascript gallery and slideshow system allows you to have simple and smooth (cross-fading) image galleries, slideshows, showcases on your website (php).
- http://smoothgallery.jondesign.net/

Coppermine
- Multi-lingual photo gallery suite. (PHP) [OS Independent]
- http://coppermine-gallery.net/

Sphene Community Tools (SCT)
- SCT contains a Wiki and Bulletin Board application which can be used out of the box to build a community website or used to extend any existing django project. (Python) [OS Independent]
- http://sct.sphene.net/

Pligg Content Management System
- An open source social content management system that allows you to create an interactive website where your users have the power to submit, vote, and talk about the news that is important to them. (PHP, MSQL) [OS Independent]
- http://www.pligg.com

Multi Router Traffic Grapher (MRTG)
- Tool to monitor the traffic load on network-links using UDP and SNMP. Provides information on licensing, development, usage, and credits. (Perl)
- http://oss.oetiker.ch/mrtg/

IP to Country
- Translates IP addresses into country names. (PHP) [OS Independent]
- http://ip-to-country.webhosting.info/

ILIAS
- A platform for Web-based training, developed at the University of Cologne/Germany. (PHP4)
- http://www.ilias.de/ios/index.html

SSID : Wlanscape
- Open source software-tool collecting and visualizing the expansion, signal-strength, and status information of wireless networks, including location based services.
- http://www.wlandscape.net/

SharpWebMail
- A WebMail application that's designed to work with a POP3 server as mailstore, and a SMTP server for sending mail. (ASP.NET, C#)
- http://anmar.eu.org/projects/sharpwebmail/

Owl Intranet Engine
- A multi-user knowledgebase system for publishing files/documents onto the web. (PHP) [OS Independent]
- http://owl.sourceforge.net

Open source mailing list manager
- PHPlist is a web application that implements a personalised mailing list manager or customer relationship management (CRM) system. (PHP, SQL)
- http://www.phplist.com

NET-SNMP Project
- Open source SNMP implementation features news, frequently asked questions, bugs list, patches available, documentation and tutorial, and mailing lists. (C, Perl) [Windows]
- http://www.net-snmp.org/

MySQL Web-based Chat
- MWChat is a Web-based chat system. (PHP4)
- http://www.appindex.net/products/detail/?product=mwchat

Newswriter 2005 - PHP NewsScript
- Administrate and publish news sections for websites, without using a database. (PHP)
- http://newswriter2005.sourceforge.net

ePoll
- ePoll is server side polling software that enables polls to be set up and administered. (Java)
- http://www.jcorporate.com/html/products/epoll/epoll_descrip.html

Simple Browser Proxy
- A browser-based proxy server that allows some degree of anonymitiy whilst brosing the World Wide Web. (PHP)
- http://sbp.sufferingfools.net

Globe*Trotter
- Geographic guestbook where visitors can place messages and comments directly on a map. Requires PHP & MySQL. (PHP,JavaScript) [Windows, Unix]
- http://globetrotter.sourceforge.net

Group-Office
- Groupware suite containing a base system and different modules including scheduler, email, file and projects. (PHP)
- http://www.group-office.com

OpenBiblio
- Automated library system with OPAC, circulation, cataloging, and staff administration functionality. (PHP)
- http://obiblio.sourceforge.net

uniLETIM
- Online Transaction and announcing processing for community exchange groups such as LETS or TimeBank. (PHP/MySQL)
- http://uniletim.sourceforge.net/

OpenEFM
- An electronic filing manager designed to be used by courts and governmental agencies, to allow the transfer of information in Legal XML. (Java) [Linux/Unix/Cygwin]
- http://openefm.sourceforge.net

NewsViking
- Script to collect news articles into a weekly digest. Uses MySQL or MS SQL. (Perl)
- http://newsviking.sourceforge.net

SourceWell
- A software announcement and retrieval system written entirely in PHP3 using a MySQL database. (PHP)
- http://sourcewell.berlios.de

Leafwa
- A web-based administration package for the Leafnode news server. (PHP)
- http://leafwa.sourceforge.net/

phpShop
- An opensource PHP-based application serving solution. Comes bundles with an e-Commerce software for building online stores.
- http://www.phpshop.org

Douglas Thrift's Search Engine
- A search engine for use on small websites. (C++, Perl) [Windows, Linux, FreeBSD, Unix]
- http://computers.douglasthrift.net/searchengine/

Achievo
- A web-based project management tool. (PHP)
- http://www.achievo.org

Ringlink
- Information and download page for Ringlink, an open source CGI Perl program that provides the tools necessary to build and run rings of websites.
- http://www.ringlink.org/

Open WebMail
- A webmail system designed to manage very large mail folder files in a memory efficient way. (Perl) [GNU/Linux, Unix]
- http://openwebmail.org/

Horde Project
- Web applications including webmail. (mainly PHP)
- http://www.horde.org/

Gedafe
- The Generic Database Frontend is a web-based database frontend for PostgreSQL that is database-application independent. (Perl)
- http://isg.ee.ethz.ch/tools/gedafe/index.en.html

GNU.FREE
- An Internet voting system. (Java)
- http://www.free-project.org/