phpBB2: Version : 0.9.2 : Most popular open source bulletin board software, it works well with any version of php and the user interface and admin panel have decent look with different options available for plugins and themes.

Nucleus : Version : 3.23 : A decent looking and powerful blog script featuring multiple blogs, multiple authors, drafts, bookmarklets & future posts.

pMachine: Version : 2.3 : A blog script featuring multiple blogs, categories/sub-categories, skins, search function, multiple languages, search engines friendly URLs.

WordPress: Version : 2.0.4 : WordPress is most popular open source blog software and the user friendly interface alongwith a personal publishing tool with focus on aesthetics and featuring cross-blog tool, password protected posts, importing, typographical niceties, multiple authors, bookmarklets.

Drupal  : Version : 4.7.2 : 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.

Geeklog  : Version : 1.4.0sr5-1 : A portal system with a wide range of integrated modules.

Joomla  : Version : (1.0.10) : Joomla! is one of the most powerful Open Source Content Management Systems on the planet. It is used all over the world for everything from simple websites to complex corporate applications. Joomla! is easy to install, simple to manage, and reliable.

Mambo Open Source  : Version : 4.5.4 : A professional but easily managed Content Management System featuring in line WYSIWYG content editors, newsfeeds, syndicated news, banners, mailing users, links manager, statistics, content archiving, date based content, 20 languages, modules and components.

PHP-Nuke  : Version : 7.8 : One of the most popular community portals with a big choice of modules and languages.

phpWCMS  : Version : 1.1-RC4 Rev. A: A blog script featuring multiple blogs, categories/sub-categories, skins, search function, multiple languages, search engines friendly URLs.

phpWebSite  : Version : 0.10.2: Strong and flexible 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.

Post-Nuke  : Version : 0.762: Blog script featuring multiple blogs, categories/sub-categories, skins, search function, multiple languages, search engines friendly URLs.

Siteframe  : Version : 3.2.2: A content management system designed for rapid deployment of community-based websites. Nice-looking templates, oriented toward document-sharing, clean interface.

Typo3  : Version : 4.0: TYPO3.org is the main developer resource of the TYPO3 project, a free CMS framework released under the GPL. This site provides lots of information about creating sites, writing extensions and developing the core of TYPO3.

Xoops  : Version : 2.0.14: Most popular advanced portal system

Crafty Syntax Live Help  : Version : 2.12.9 : A Live Help chat system featuring monitor your visitors, proactively open a chat session, multiple chat sessions, referrer tracking, page view tracking, multiple operators, canned responses/URLs, multiple departments each with different icons, leave a message.

Help Center Live  : Version : 2.1.2 : 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.

osTicket  : Version : 1.3.1 : A Support Tickets system featuring email piping, POP3 login, unlimited email addresses, admin/staff/user panels, avoid autoresponder loops, limit maximum tickets user can have opened, accept attachments and limit size, pager alerts for admin.

PerlDesk : Version : 2.25 : Browser based help desk software and email management solutions designed to streamline the operation of managing emails, support tickets and customer communications, with built in tracking and response logging it is an ideal help desk solution for companies with one or more members of staff or for those who want to organise client communications.

Support Logic Helpdesk : Version : 1.2 : A Support Ticket system with multiple email addresses, admin/staff/user panels, canned responses, HTML tags support, email limit on a per user/day basis, attachments.

Support Services Manager : Version : 1.0b : A blog script featuring multiple blogs, categories/sub-categories, skins, search function, multiple languages, search engines friendly URLs.

b2evolution  : Version : 0.9.2: A blog script featuring multiple blogs, categories/sub-categories, skins, search function, multiple languages, search engines friendly URLs.

OS Commerce  : Version : 2.2 MS2 (051113): 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.

Zen Cart  : Version : 1.3.0.2: Zen Cart™ truly is the art of e-commerce; a free, user-friendly, open source shopping cart system. The software is being developed by group of like-minded shop owners, programmers, designers

FAQMasterFlex : Version : 1.1 : Configure Unlimited categories/questions/answers alongwith web based administration.

4images Gallery : Version : 1.7.2 [Security-Patched-1] : An Image Gallery system featuring unlimited categories/subcategorizes, web-based and FTP images upload, auto-thumbnails, comments, send a picture, rate a picture, random pictures, extensive administration panel.

Coppermine Photo Gallery  : Version : 1.4.8: 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.

PHPlist  : Version : 2.10.2: A powerful mailing list script alongwith multiple mailing lists and attachments option.

Advanced Poll : Version : 2.03 : Advanced Poll. A highly windows-inspired poll script.

phpESP : Version : 1.7.5: 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.

PHPSurveyor : Version : 0.99 : 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.

dotProject : Version : 2.0.1: Project Management featuring companies, projects, tasks (with Gantt charts), forums, files, calendar, contacts, tickets/helpdesk, language support, user/module permissions, themes.

PHProjekt : Version : 5.1 : 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.

PhpWiki  : Version : 1.2.10: 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.

TikiWiki  : Version : 1.9.2: 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.

Moodle  : Version : 1.6.1: 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

Noah’s Classifieds : Version : 1.3: 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.

Open-Realty : Version : 2.3.4 : Real Estate listing system featuring attachments, flexible search, template system, Yahoo Maps interface.

phpAdsNew : Version : 2.0.8 : 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.

PHPauction  : Version : 2.1: 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.

phpFormGenerator : Version : 2.09c : 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.

WebCalendar : Version : 1.0.4 : A very powerful webcalendar featuring private and public calendars.