WordPress is the largest self-hosted blogging tool in the world. It is used on hundreds of thousands of sites and seen by tens of millions of people every day.

This free enterprise-ready software helps your business manage contacts, appointments and to-do lists.

This PHP-based calendar application can be configured as a single-user calendar, a multi-user calendar for groups, or as an event calendar that visitors can view.

Coppermine is a multi-purpose fully-featured and integrated web picture gallery script written in PHP using GD or ImageMagick as image library with a MySQL backend.

Gallery is an open source web based photo album organizer. Gallery gives you an intuitive way to blend photo management seamlessly into your own website whether you’re running a small personal site or a large community site.

Lightweight script that allows you to generate lists of files and folders on a generated webpage.

B2evolution is a free blog tool for the next generation of blogs. It includes all the features of traditional blog tools, and extends them with evolved features such as file & photo management, advanced skinning, multiple blogs support as well as detailed user permissions…

Mambo is a dynamic portal engine and content management system. The backend is very intuitive and fully customizable.

OpenBiblio is an easy to use, automated library system written in PHP containing OPAC, circulation, cataloging, and staff administration functionality.

For each visitor BBClone counter can display: IP address, operating system, browser, referrer, visit date, page visits and number of visitors. staff administration functionality.

OsCommerce features a rich set of out-of-the-box online shopping cart functionality.

An open source implementation of a WikiWikiWeb in PHP

The Postnuke Content Management System offers full CSS support and HTML 4.01 transitional compliance throughout.

Since its creation in 2000, phpBB has become the most widely used Open Source forum solution.

A unique system that features dynamic graphical menus, different templates based on browser type, automatic image scaling and user groups.

UebiMiau is a simple, yet efficient mail reader (webmail) supporting both IMAP and POP3 without dependence of any PHP’s extra modules or database.

Turn Key Online Application with Free Upgrades; No Software to Purchase or Install; Control all Your Selling Needs; Fast & Easy to Get Started.

TUTOS is a tool to manage the organizational needs of small groups, teams, departments.

XRMS is a fully-integrated suite of web-based tools for Customer Relationship Management (CRM), Sales Force Automation (SFA), and Business Intelligence (BI) tools.

LimeSurvey is an open source web application written in PHP that is used for creating, publishing, and collecting survey responses online or offline.