Links
Boonex
Social networking web application, forums e.t.c
MediaWiki
MediaWiki is a free software wiki package originally written for Wikipedia. It is now used by several other projects of the non-profit Wikimedia Foundation
php Link Directory
phpLD is now the most widely used directory script on the internet. ... Another great advantage of phpLD is the number of templates and mods available. ...
PrestaShop - OS Shopping Cart
Free, opensource php shopping cart
Sendcard : a Free PHP script for an ecard system
sendcard is a free PHP ecard system script capable of handling thousands of cards. It works with 9 different databases.
WordPress
WordPress is a state-of-the-art semantic personal publishing platform with a focus on aesthetics, web standards, and usability. What a mouthful. WordPress is both free and priceless at the same time.
WordPress Developer Documentation
WordPress believes in keeping it simple, and a lot of thought goes into including new functionality as a part of the "core" WordPress code, in order to keep WordPress fast and lightweight. Still, users often find the need to graft additional functionality onto WordPress to meet their needs. This section of the Codex offers guidelines and references for anyone wishing to modify, extend, or contribute to WordPress.
WordPress Themes
Collection of WordPress themes with a graphical and textual preview available for each theme. Sorting and search feature as well.