Ad Management

Openads 
Openads (aka phpAdsNew & phpPgAds) is an open source ad server, which has a banner management interface and a statistics tracking system, and with which users can rotate banners and advertisements.

phplist 
phplist is an open source newsletter script, which includes multiple mailing lists and attachments. Other supported features include: RSS, click-tracking, scheduling, etc. phplist is free to install and very easy to integrate with any website.

Blog

Movable Type 
Movable Type 4, which has a redesigned user interface and more than 50 new features, will help users create a blog and insert text and photos via a WYSIWYG editor. There is a built-in member registration system for comment authentication as well as support for OpenID.

Textpattern 
Textpattern is a PHP-based weblogging tool, which allows users to publish web content without the need to know HTML, and offers a commenting system, file, image and link management systems, RSS syndication, site statistics, multi-language support.

WordPress
WordPress is one of the most widely used and most powerful blogging tool on the Internet. It offers customizable dashboard, multi-file uploading, one-click plug-in upgrades, built-in galleries, media library, WYSWYG editor and many others. Bloggers can publish photos all by themselves, and even embed YouTube videos!

b2evolution 
b2evolution is a powerful blog tool you can install on your personal or business website in no time. It includes all the features of traditional blog tools plus some advanced features such as file & photo management, advanced skins, multiple blogs support, third party plug-ins and many more!

Calendar

Maian Events
Maian Events is a simple event calendar system, which includes Auto install file, event emoticons, Add/Delete/Edit events options, Set start and end dates options and has a simple interface.

Classified Ads

Classifieds
Classifieds is a tool, which offers categories and subcategories of various depth, image upload, thumbnails and e-mail notifications.
 

Content Management

Drupal 
Drupal is an open source content management tool for creating dynamic websites. It offers various options such as news aggregation and XML publishing. With this advanced open source CMS software you are in full control of your website content and visitors.
 

Geeklog 
Geeklog is a weblog, which enables users to create dynamic websites. It allows visitors to register, submit stories and comment on posts. Users can upload information on their sites and choose the layout they want to view.
 

Joomla
Joomla is one of the most popular open source content management systems. It is used for creating not only simple websites, but also complex applications, and is easy to install and manage.
 

Mambo 
Mambo is a content management tool used for creating everything between several and several thousand pages, from simple websites to complex applications. It offers built-in modules, a WYSIWYG editor, site statistics, an admin interface, multi language support, etc.

Moodle  
Moodle is a course management system with which educators can create online courses. It is available in 34 languages and has a WYSIWYG HTML editor. Beside the various course activities, among them forums, journals, quizzes, surveys and workshops, Moodle offers also user logging and tracking, and mail integration options.
 

Nucleus
Nucleus is a content management system, which allows users to maintain weblogs and online journals. It supports multiple blogs, authors, drafts, posts and bookmarklets.

Open-Realty
Open Realty is a free listing management tool for creating real estate websites. It is easy to build and maintain.

WebSiteBaker  
Website Baker is a content management system, which allows users to create simple websites with minimum efforts. Its user-friendly interface and catchy templates allows for quick set-up of both personal and business.
 

fuzzylime (cms) 
fuzzylime is a CMS, which helps users run their websites and keep them up to date from any computer with internet connection and without the need to know HTML.
 

PHP-fusion
PHP-Fusion is a PHP-based content management system, which uses a MySQL database for storing website content, and has a simple administration system.

phpWebSite 
phpWebSite enables users to maintain a community-driven interactive website with ease. It has many administration modules for website customization.
 

xoops 
XOOPS is an object oriented, PHP-based web content management system for building both small and large community websites, corporate portals and weblogs.

Customer Support

HelpCenter Live
It is an all-inclusive help center, which offers Live Help, Support Tickets and FAQ, and enables users to monitor visitors, initiate chat, collect visitor information, leave messages, etc.

 

phpTickets 
phpTickets is a PHP-based trouble ticket support system, which uses a MySQL database for storage purposes. Tickets are assigned unique numbers and are tracked and replied to according to the respective tracking number.

Discussion Board

phpBB2 
phpBB2 is one of the most famous bulletin board solutions. It is open source forum software, which offers private messaging, search options, customizable templates and multiple database support, among other features. Millions of individuals and businesses have embraced this PHP forum software because of its rich set of functionalities and easy utilization.
 

Simple Machines Forum (SMF) 
Simple Machines Forum, or SMF, is a professional grade message board tool, which allows users to set up online communities quickly and easily. The tool gives you total control over your message board’s layout. Thanks to its unique SSI function you can make your forum and your website interact with each other.

E-Commerce

OS CommRes
OS CommRes is an open source booking system, which includes a Call Centre module, and offers inventory management, sales auditing and bookings analysis. If you are looking for an easy to manage online store building tool with an integrated option for maintaining long-term after-sales contact with your customers. - this is the right software for you.
 

osCommerce 
osCommerce is an multi-functional and multi-lingual open source e-commerce solution, which allows users to create online shops quickly and easily. No particular programming skills are needed to handle the easy set-up process and manage all your online shop services and features.

Groupware Tools

dotProject 
dotProject is an online project management application, including a rich set of project layout and control functions. With this project manager tool you can easily organize tasks, schedules and the communication between the project participants.

 

PHProjekt
PHProjekt is a modular application for coordinating group activities and for sharing information and documents across the web. It offers project, file and contact management options, time card, mail client and many other modules.

Guestbooks

MJGUEST 
MJGUEST is a guestbook, perfect for both personal websites, for collecting visitors’ comments, and business websites, for gathering customer feedback

Image Galleries

4images Gallery 
4images is an online image gallery management system, which offers a comment system, user registration and management, a password protected administration area, browser-based upload options and HTML templates for page layout.
 

Coppermine 
Coppermine is a photo gallery script, which offers support for various media files. Users can upload and rate pictures, add comments and send e-cards. The gallery itself can be private, accessible to registered users only, or open to all visitors.
 

Gallery2 
Gallery2 is a PHP-based online tool for creating and managing photo albums via an intuitive interface. The available options include automatic thumbnail creation, image resizing, rotation, ordering, captioning, searching and more.

plogger
Plogger is an open source photo gallery solution for image sharing. It has an easy to use administrative interface. Integrating this gallery software into an existing website is easy as well.

Web Hosting Tools

phpCOIN
phpCOIN is a comprehensive billing/invoicing application, ideal for web hosting resellers to manage their customer orders, invoices, notes and helpdesk. It can be also used by different types of businesses.

Wiki

DokuWiki
DokuWiki is an easy to use Wiki software, aimed at creating all types of documentation. It is best for developer teams, workgroups and small companies. All data is stored in plain text files and no database use is required.