PHP-Nuke: Very popular content management and portal solution featuring web-based administration, surveys, customizable blocks, modules and themes with multilanguage support

phpWebSite: A complete web site content management system ( CMS ). All client output is XHTML 1.0 and meets the W3C's Web Accessibility Initiative requirements for government agencies.

Post-Nuke Content Management: Two complete solutions for any webmaster who would like to develope his own portal. A superb application with limitless modules for building an online community quickly, easily, and effortlessly. Two content management systems for building a dynamically generated web site that five years ago would have cost hundreds of thousands of dollars to launch.

Geeklog: An easy-to-use weblog publishing system powered by PHP and MySQL. With many features to get you started, Geeklog's user-friendly structure lets you set up a functioning, dynamic website in minutes!

Xoops Portal System: An extensible, OO (Object Oriented) management system written in PHP. Ideal for developing small to large dynamic community websites, intra-company portals, weblogs and much more.

Drupal: A dynamic community publishing platform. Drupal integrates many popular features of content management systems, weblogs, collaborative tools and discussion-based software.

Siteframe: A powerful content-management system designed for the rapid deployment of community-based websites. Users can share stories, comments, photographs and more.

phpLinks: A powerful links directory script. Build a link directory like DMOZ/Yahoo Directory with search capabilities and more.

Mambo Open Source: Mambo is a full-featured content management system that can be used for everything from simple websites to complex corporate applications.

Typo3: A High-end open source content management system with a host of features. Designed for enterprise purposes on the web and in intranets.

phpWCMS: Do you want to be free in changing the website layout without re-editing the whole content? PhpWCMS is your answer to this and more. Ideal for websites with lots of pages.

FAQMasterFlex: Allows you to manage frequently asked questions. You can create/edit/delete entries using user-friendly web based interface. Unlimited categories/questions/answers, web-based administration.

b2evolution: b2evolution is probably the most comprehensive blog engine you can find! It includes almost any feature you could expect from a blog tool, and more.

WordPress: WordPress is a personal publishing tool with focus on aesthetics and featuring cross-blog tool, password protected posts, importing, typographical niceties, multiple authors, bookmarklets.

Nucleus: Nucleus offers you the building blocks you need to create a web presence. Whether you want to create a personal blog, a family page, or an online business site, Nucleus CMS can help you achieve your goals.

pMachine: Publish virtually any kind of web content - from a basic weblog, to an advanced interactive magazine. pMachine gives you a complete solution to maximize interactivity.

PHProjekt: Project Management features 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.

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

Help Center Live: A powerful help desk system designed to support an unlimited number of clients. Perfect for webhosts and anyone who needs to resolve client technical support issues easily and effortlessly.

Crafty Syntax Live Help: Put Crafty-Syntax Live Chat on your site and chat with your visitors in real-time. Truly a marvel! Feature rich. Ideal for anyone who recognizes the value of chat-supported sites.

PHP Support Tickets: Manage customer queries with this full featured customer helpdesk solution.

osTicket: A simple and lightweight support ticket program designed to be easy to install and setup.

Support Logic Helpdesk: The Support Logic Helpdesk is a script to provide an organized support platform for you and your clients. Support requests can be sent by email and directly through the helpdesk via "tickets".

Support Services Manager: A powerful Support Desk and Knowledge Base application. 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.Ecommerce/Carts.

 CubeCar: An easy to use yet powerful shopping cart featuring unlimited categories and products, multiple payment gateways, downloadable products. The design is very easy to modify.

OS Commerce Cart: On online e-commerce solution that rivals Amazon's own system. Feature packed out-of-the-box installation allows store owners to setup, run, and maintain their online stores with minimum effort.

RedHat Interchange Cart: Interchange is the world's leading open source e-commerce platform. With over six years of history and thousands of deployments, Interchange provides the rich functionality and business-critical reliability that today's leading enterprises demand.

Agora Shopping Cart: 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.

Zen Cart: A user-friendly, open source shopping cart system. The software is being developed by group of like-minded shop owners and, programmers who think e-commerce could be fun and easy! Designed for online merchants, online shoppers, web designers, and developers Image Galleries.

 4/images Gallery: An image gallery system. Features include comment system, user registration, password protection, browser-based & FTP upload, auto-thumbnails, send a picture, rate a picture, random pictures, search pictures and a whole lot more!

Gallery: Manage your photos on your own website! With Gallery you can easily create and maintain albums of photos. Featuring albums within albums, thumbnailing specific picture area, captions, rotate, reorder pictures, album-based attributes, album mirroring.

Coppermine Photo Gallery: 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.  Mailing List 

PHPlist: A personalized mailing list manager and customer relationship management system. PHPlist is designed to assist you to stay in touch with your audience, without flooding them with information they don't want

.MailMan: Allows managing of email discussion and e-newsletter lists. Mailman is integrated with the web, making it easy for users to manage their accounts and for list owners to administer their lists. Mailman supports built-in archiving, automatic bounce processing, content filtering, digest delivery, spam filters, and more Polls and Surveys.

 Advanced Poll: Advanced Poll is a polling system with powerful administration tool. It features multiple polls, templates, unlimited options, multi-language support, IP-Logging, IP-Locking, cookie support, comment feature, vote expire feature, random poll support and more.

PHPSurveyor: Develop, publish and collect responses to surveys. Display surveys as single questions, group by group or all in one page or use a dataentry system for administration of paper-based versions of the survey. PHP Surveyor 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.

phpESP: 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.

ViPER: A High end guestbook script that is versatile, reliable, and easy to use.Wiki.

 PhpWiki: PhpWiki is a WikiWikiWeb clone in PHP. A WikiWikiWeb is a site where anyone can edit the pages through an HTML form. Multiple storage backends, dynamic hyperlinking, themeable, scriptable by plugins, full authentication, ACL's.

TikiWiki: An online news system featuring tightly integrated subsystems including: forum, newsletter, blog, image gallery, poll/survey, quiz, FAQ, chat, banner, webmail, maps, calendar, and more. Other Misc Scripts.

 Moodle: 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.

WebCalendar: A very powerful webcalendar featuring private and public calendars. Maintain a web-based calendar for one or more persons and for a variety of purposes.

Noah’s Classifieds: 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: A web based listing management application for realtors. It is intended to be both easy to setup and use. Fast and flexible tool for showcasing your properties and increasing your commissions. Features attachments, flexible search, template system, Yahoo Maps interface.

phpAdsNew: An banner ad server with an integrated tracking system for gathering statistics. With phpAdsNew you can easily rotate paid banners and your own in-house banner advertisements. Featuring different types of ads, display based on keywords, zones, hour of the day, day of the week, extensive statistics, client statistics.

phpFormGenerator: A form generator featuring up to 100 form fields, all kind of input fields including file upload, customizable fields attributes, send submitted data to an email address or store them in a database or admin panel.

phpCOIN: A full billing/invoicing application, handle clients, orders, invoices, notes and more! Perfect for webhosting resellers or designers, lawyers and accountants.

PHPauction: Start your own online auction. Charge for the service and provide different payment methods including paying “on the fly”. Offers a friendly administration, flexibility and easy customization.