Short description: A blog script featuring multiple blogs, categories/sub-categories, skins, search function, multiple languages, search engines friendly URLs.
Homepage: http://b2evolution.net/

Short description: A powerful blog script featuring multiple blogs, multiple authors, drafts and future posts, bookmarklets.
Homepage: http://nucleuscms.org/

Short description: This is a features limited version of pMachinePro. (You need a license, in order to use pMachine Free on commercial or profit oriented websites).
Homepage: http://www.pmachine.com/

Short description: A personal publishing tool with focus on aesthetics and featuring cross-blog tool, password protected posts, importing, typographical niceties, multiple authors, bookmarklets.
Homepage: http://wordpress.org/

Short description: A widely-popular open-source bulletin-board package, works well, simple user interface and admin panel, clean look, scales well, and can be customized.
Homepage: http://www.phpbb.com/

Short description:  Elegant, powerful, easy to use and it is the next-generation community forum software package that is jam-packed with features, while at the same time having a minimal impact on resources.
Homepage: http://www.simplemachines.org/

Short description:  An award-winning scaleable bulletin board system, allows you to effortlessly build, manage and promote your online community. Advanced yet intuitive features like multi-moderation allow you to focus on developing your community, rather than wrestling with complex settings.
Homepage: http://www.invisionboard.com/

Short description:  A leading forum/message board software package that provides a real-time chat and support system for your visitors. While other chat programs only allow people to talk directly when they are on at the same time, with YaBB, you can talk anytime.
Homepage: http://www.yabbforum.com/

Short description:  A PHP/MySQL port revision of the popular forum software YaBB. Incorporating the same intuitive user interface, and several of the most popular modifications from YaBB's Boardmod program.
Homepage: http://sourceforge.net/projects/yabbse/

Short description:  A high performance php-based chat server software for a live chat-room or -module on every php-based site.
Homepage: http://phpopenchat.org/

Short description: An easy-to-use, multi-room chat based on PHP and a database, supporting MySQL, PostgreSQL, and ODBC.
Homepage: http://phpmychat.sf.net/

Short description:  Written entirely in ASP & VBScript.
Homepage: http://www.happytech.net/Applications/LiveChat/chat.asp

Short description:  A slick, multi language guestbook with several colors and skins to choose from.
Homepage: http://www.vipergb.de.vu/

Short description:  An Advanced PHP-based guestbook script.
Homepage: http://www.proxy2.de/scripts.php

Short description: A power-user shopping cart with a big variety of modules and support of almost every payment gateway. A big developers community is ready to offer custom solutions depending on your needs.
Homepage: http://oscommerce.com/

Short description:  A powerful online shopping / e-commerce solution that offers a wide range of out-of-the-box features that allows online stores to be setup in simple fashion for the beginner, yet it offers high power ecommerce, flexibility, and modular features that an experienced programmer or web designer will appreciate.
Homepage: http://www.agoracart.com/

Short description:  A user-friendly, open source shopping cart system. A robust and customizable electronic storefront that's easy to keep up-to-date with new features. The program provides several "Spotlight" lists in addition to the traditional category to product links. In short, it's a ecommerce software the way it should have been all along.
Homepage: http://www.zen-cart.com

Short description:  A powerful eCommerce shopping cart/store system written in PHP & MySQL. With one of the largest Plug and Play Shipping/Gateway/Affiliate Modules, Multi Currency Support, Inventory Stock Control, Customer Email Marketing System, Unlimited product options and much more.
Homepage: http://cubecart.com/

Short description: Unlimited categories/questions/answers, web-based administration.
Homepage: http://www.technetguru.net/design/faqmasterflex.php

Short description: An Image Gallery system featuring unlimited categories/subcategories, web-based and FTP images upload, auto-thumbnails, comments, send a picture, rate a picture, random pictures, extensive administration panel.
Homepage: http://www.4homepages.de/

Short description: An Image Gallery system featuring categories and albums, thumbnails and intermediate size pics, search feature, new and random pictures, user management (private galleries, groups), user comments, e-cards feature, slideshow viewer.
Homepage: http://coppermine.sourceforge.net/

Short description: An Image Gallery system featuring albums within albums, thumbnailing specific picture area, captions, rotate, reorder pictures, album-based attributes, album mirroring.
Homepage: http://gallery.menalto.com/

Short description: A powerful mailing list featuring multiple mailing lists and attachments.
Homepage: http://www.tincan.co.uk/

Short description: A highly windows-inspired poll script.
Homepage: http://www.proxy2.de/scripts.php

Short description: PhpESP is an effective, capable, web-based survey application that enables businesses to create complex and advanced surveys, view results in real time, and carry out advanced analysis.
Homepage: http://phpesp.sourceforge.net/

Short description: Develop, publish and collect responses to surveys. Display surveys as single questions, group by group or all in one page or use a data entry system for administration of paper-based versions of the survey. It can produce 'branching' surveys (set conditions on whether individual questions will display), can vary the look and feel of your survey through a templating system, and can provide basic statistical analysis of your survey results.
Homepage: http://phpsurveyor.sourceforge.net/

Short description: A Course Management System designed to help educators create quality online courses. Available in currently 34 languages, featuring WYSIWYG HTML Editor, teacher has full control over all settings for a course, flexible array of course activities (Forums, Journals, Quizzes, Resources, Choices, Surveys, Assignments, Chats, Workshops), user logging and tracking, mail integration and much more.
Homepage: http://moodle.org/

Short description: A classifieds system featuring categories and subcategories in unlimited depth, image upload for categories and classifieds, variable fields per categories, customizable email notifications, locking categories, classifieds approval, auto-thumbnail generation, classifieds management by user, send classified to a friend.
Homepage: http://classifieds.phpoutsourcing.com/

Short description: Real Estate listing system featuring attachments, flexible search, template system, Yahoo Maps interface.
Homepage: http://www.open-realty.org/

Short description: A highly professional complete ad server featuring different types of ads, display based on keywords, zones, hour of the day, day of the week, extensive statistics, client statistics.
Homepage: http://phpadsnew.com/

Short description: The GPL version of PHPauction featuring email notification of bids, attachments, reserve price, minimum bids, standard and dutch auctions, bid history, send auction to a friend, highest bids, auctions ending soon.
Homepage: http://www.phpauction.org/

Short description: A full billing/invoicing application, perfect for webhosting resellers, etc. You can install only one instance of phpCOIN!
Homepage: http://www.phpcoin.com/

Short description: A form generator featuring up to 100 form fields, all kind of input fields incl. file upload, customizable fields attributes, send submitted data to an email address or store them in a database, admin panel.
Homepage: http://phpformgen.sourceforge.net/

Short description:  An open source PHP script. Which allows you to run a very powerful link exchange or a full blown search engine. With multilevel site categorization, infinite threaded search capabilities and more.
Homepage: http://www.dew-code.com/

Short description:  An open source project written in PHP for use with MySQL, allowing one to run an extremely efficient Link Farm with full search capabilities. A "simulated" search engine in many ways.
Homepage: http://www.newphplinks.com/

Short description: A very powerful webcalendar featuring private and public calendars.
Homepage: http://www.k5n.us/webcalendar.php

Short description:  A web-based open-source Perl email client for sending and receiving messages, with a friendly, attractive, icon-based user interface that supports Multiple languages.
Homepage: http://neocodesolutions.com/software/neomail/

Short description:  A open source, web-based PHP email client with a intelligent object oriented design, which supports many localization features such as unicode and right-to-left text.
Homepage: http://www.horde.org/

Short description:  A web-based email package built-in pure PHP and supports the IMAP and SMTP protocols, and renders in pure HTML 4.0 (with no JavaScript) for maximum compatibility across browsers. It has all the functionality you would want from an email client, including strong MIME support, address books, and folder manipulation.
Homepage: http://www.squirrelmail.org/
 

Short description:  A HTML form to e-mail gateway that parses the results of any form and sends feedback to the specified users. This script has many formatting and operational options, most of which can be specified within each form, meaning you don't need programming knowledge or multiple scripts for multiple forms.
Homepage: http://www.scriptarchive.com/formmail.html
 

Short description:  A mature, intelligent, open source mail filter which uses a diverse range of tests to identify unsolicited bulk email, more commonly known as Spam. These tests are applied to email headers and content to classify email using advanced statistical methods before it reaches your mailbox.
Homepage: http://spamassassin.apache.org/
 

Short description:  A anti-virus toolkit that integrates with mail servers (attachment scanning). The package provides a flexible and scalable multi-threaded daemon, a command line scanner, and a tool for automatic updating via Internet. The programs are based on a shared library distributed with the Clam AntiVirus package, which you can use with your own software. Most importantly, the virus database is kept up to date.
Homepage: http://www.clamav.net/
 

Short description: An advanced portal with collaborative book, search engines friendly URLs, online help, roles, full content search, site watching, threaded comments, version control, blogging, news aggregator.
Homepage: http://drupal.org/

Short description: A portal system with a wide range of modules.
Homepage: http://www.geeklog.net/


Short description: A professional level yet easy to use Content Management System featuring inline WYSIWYG content editors, news feeds, syndicated news, banners, mailing users, links manager, statistics, content archiving, date based content, 20 languages, modules and components.
Homepage: http://mamboserver.com/

Short description: phpWCMS is perfect for professional, public and private users. It is very easy to learn and gives you the flexibility to separate layout and content. Lots of powerful but simple implemented features assists publishers and web developers too.
Homepage: http://www.phpwcms.de/

Short description: Very powerful Content Management System with document manager, announcements, menu manager, photo album, block maker, FAQ, web pages maker, polls, information categorizer, calendar, link manager, form generator.
Homepage: http://phpwebsite.appstate.edu/

Short description: A Content Management System with focus on flexibility and security. A big variety of modules and blocks makes this CMS an all round tool.
Homepage: http://www.postnuke.com/

Short description: A straightforward content-management system designed for rapid deployment of community-based websites. Nice-looking templates, oriented toward document-sharing, clean interface.
Homepage: http://siteframe.org/

Short description: A very popular advanced portal system.
Homepage: http://www.xoops.org/

Short description:  A professional web portal system with web based admin, surveys, access stats, counter, topic manager, edit/delete stories option, moderation system, referrers page, sections manager, customizable HTML blocks, user and authors edit, an integrated Banners Ads system, search engine, and many more friendly functions.
Homepage: http://phpnuke.org/

Short description:  An open source content management system for enterprise purposes on the web and in intranets. It offers full flexibility and extendibility while featuring an accomplished set of ready-made interfaces, functions and modules.
Homepage: http://www.typo3.com/

Short description:  A content management system written in php and using the popular open source mySQL database system for content storage. It's completely free and totally customisable, and in constant development.
Homepage: http://www.e107.org/

Short description: A Live Help chat system featuring monitor your visitors, proactively open a chat session, multiple chat sessions, referer tracking, page view tracking, multiple operators, canned responses/images/URLs, multiple departments each with different icons, leave a message.
Homepage: http://www.cslh.com/

Short description: Very powerful all-in-one help center including Live Help, Support Tickets and FAQ. Features include unlimited operators/departments, monitor visitors, initiate chat, collect visitor's information, track visitor's footprint, autosave chat transcripts, canned messages, leave a message, auto-assign tickets to operators, unlimited FAQ topics.
Homepage: http://www.helpcenterlive.com/

Short description: A Support Tickets system featuring email piping, pop3 login, unlimited email addresses, admin/staff/user panels, avoid autoresponder loops, limit maximun tickets user can have opened, accept attachments and limit size, pager alerts for admin.
Homepage: http://www.osticket.com/server/

Short description: A simple, one-admin Support Tickets system featuring self-registering, emailing to admin, attachments.
Homepage: http://www.phpsupporttickets.com/

Short description: A Support Tickets system featuring multiple email addresses, admin/staff/user panels, canned responses, HTML tags support, email limit on a per user/day basis, attachments.
Homepage: http://www.support-logic.com/index.php

Short description: a powerful Support Desk and Knowledge Base application. It includes many powerful features to allow you to easily add a full-featured Knowledge Base along with a robust support request or "trouble ticket" management system to your existing support services.
Homepage: http://scripts.sheddtech.com/ssm/index.php
 

Short description: Project Management featuring companies, projects, tasks (with Gantt charts), forums, files, calendar, contacts, tickets/helpdesk, language support, user/module permissions, themes.
Homepage: http://www.dotproject.net/

Short description: Project Management featuring optional group system, privileges, calendar, contacts, time card, projects, chat, forum, request tracker, mail client, files, notes, bookmarks, to-do list, reminder, voting, language support.
Homepage: http://www.phprojekt.com/
 

Short description: TikiWiki is designed to be an international, clean and extensible Content Management System and Groupware that can be used to create all sorts of web applications, sites, portals, intranets and extranets. TikiWiki also works great as a web-based collaboration tool. TikiWiki has a lot of native options and sections that you can enable/disable as you need them.
Homepage: http://www.tikiwiki.org/

Short description: PhpWiki is a web site where anyone can edit the pages through an HTML form. Linking is done automatically on the server side; all pages are stored in a database.
Homepage: http://phpwiki.sourceforge.net/
 

Short description:  From basic, informational websites to robust e-business applications, Soholaunch vastly simplifies the creation and management of unique, purposeful websites that speak and work for small businesses.
Homepage: http://www.soholaunch.com

Short description:  A series of static website templates which can be installed and immediately used to start building your website even if you do not want to learn how to manage a CMS. Perfect for new and/or inexperienced users who want to have a standard website setup quickly and later develop it according to their needs.
Homepage: http://netenberg.com/templates_express.php
 

Short description:  A fast, full featured, robust web site log file analysis program. It produces highly detailed, easily configurable usage reports in HTML format, for viewing with a standard web browser.
Homepage: http://www.mrunix.net/webalizer/

Short description:  A powerful, full featured tool that generates advanced web server statistics, graphically. This log analyzer works as a CGI or from command line and shows you all possible information your log contains, in few graphical web pages. It uses a partial information file to be able to process large log files, often and quickly.
Homepage: http://awstats.sourceforge.net

Short description:  A program to measure the usage on your web server. It tells you which pages are most popular, which countries people are visiting from, which sites they tried to follow broken links from, and all sorts of other useful information.
Homepage: http://www.analog.cx/