Twill is an open source CMS toolkit for Laravel
Odamex is a free, cross-platform, modern client-server Doom engine
The Free / Libre / Open Source Web App with the most built-in features
Content management system built on PHP, MySQL, Twitter Bootstrap
Lighweight CRM, easy to use Kickstarter for web based ERP
Java Application Framework
The Free & Popular FLARUM Web Software in a Complete Virtual Machine
Responsive Web App development full-stack framework in PHP and JS
A canvas library for generating technical drawings
Declarative rich internet application platform
Generates text that depends on changing data (like dynamic HTML).
Mature SGBD in Perl with a web interface
GTAjax is Generally-Targeted AJAX.
JavaScript library for modern browsers with a jQuery compatible API
A Task Processing Framework for Java
jQuery plugin, provides simple notification
Scratching the future now!