Blogging Scripts

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: WordPress is a blogging software with a focus on ease of use, elegance, performance, and standards with a huge selection of themes and plugins.
Homepage: http://wordpress.org/

Classfied Advert Scripts

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://www.noahsclassifieds.org/

Content Management

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: 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.
Homepage: http://www.joomla.org/

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

Short description: One of the most popular community-based portals with a big choice of modules and languages.
Homepage: http://www.phpnuke.org/

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 allround 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: TYPO3 is a free Open Source content management system for enterprise purposes on the web and in intranets. It offers full flexibility and extendability while featuring an accomplished set of ready-made interfaces, functions and modules.
Homepage: http://www.typo3.com/

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

Customer Relationships

Short description: 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/images/URLs, multiple departments each with different icons, leave a message.
Homepage: http://www.craftysyntax.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, auto save 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 auto-responder loops, limit maximum 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

Discussion Boards / Forums

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. Effective. Powerful. Free. SMF is all of the above. SMF is a next-generation community software package and is jam-packed with features, while at the same time having a minimal impact on resources.
Homepage: http://www.simplemachines.org/

E-commerce / Shopping Cart Scrips

Short description: 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.
Homepage: http://www.cubecart.com/

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: 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, and consultants that think e-commerce could be and should be done differently.
Homepage: http://www.zen-cart.com/

F.A.Q

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

Image Gallery

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/

Mailing Lists

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

Polls and Surveys

ADVANCED POLLS

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

Short description: LimeSurvey (formerly PHPSurveyor) is an open source online survey application. It enables users to develop, publish and collect responses to surveys. Surveys can include branching, custom preferred layout and design (using a web template system), and can provide basic statistical analysis of survey results. Surveys can be public, or can be strictly controlled through the use of "once-only" tokens for each survey participant.
Homepage: http://www.limesurvey.org/

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/

Project Management

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/

Site Builders

Short description: From basic, informational websites to robust e-business applications, this script vastly simplifies the creation and management of cutting-edge internet solutions. It installs at the end-users web site and empowers novices and seasoned developers alike with a streamlined development and management process unmatched by any other software product.
Homepage: http://www.soholaunch.com/

Short description: Use Templates Express to install static templates to your website. You will need to use FTP and edit the html files, replacing the default text with your own text. Standard information like title, name, address and similar will be collected during installation and placed into the installed template in the appropriate locations.

Wiki

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/

Other Scripts

Short description: A Link Directory featuring categories, reviews, popular links, new links, links approval.
Homepage: http://www.dew-code.com/

Short description: A course management system designed to help educators create quality online courses. Available in 34 languages and features a WYSIWYG HTML editor. The teacher has full control over all settings for a course. There is a 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: 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/

php FORM GENERATOR

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/

Web Calendar

Short description: A very powerful web calendar featuring private and public calendars.
Homepage: http://webcalendar.sourceforge.net/