"I have studied many philosophers and many cats. The wisdom of cats is infinitely superior." - Hippolyte Taine
zena is a Ruby on Rails CMS (content managment system) with a focus on usability, ease of customization and web 2.0 goodness (application like behaviour). Please use rubygems for stable install (gem install zena). Visit zenadmin.org for details.
Tournament management system based on zKup which isn't free since the version 3.
μCMS is a lightweight Content Management System written in PHP/MySQL. It features an object-oriented model very modular, a theming system, per-user security rights etc...
WORKsystem CMS e-commerce , PHP5 for xAMP and Jquery/ajax framework, Web2.0 commerce: PLM, workflow, shopping cart, content, package, document, language, price, stock, invoice, supplier, mailing, usergroup, RSS, webservices, survey, events, calendar
squash ladder PHP - a modular web application and content management system for automating the running of online sports and gaming ladders - written in PHP / MySQL