ackerTodo is a web-based todo list manager which supports multiple users, recurring tasks, multiple languages, categories and much more! It's written in PHP/MySQL.
Self Service Business Intelligence, Analytics & Performance Management
Jedox is the fastest Open-Source BI solution for Performance Management including Planning, Analysis, Reporting and ETL. The Open Core consist of an in-memory OLAP Server, ETL Server and OLAP client libraries.
A web-based Go ("http://en.wikipedia.org/wiki/Go_(board_game)") playing client and server.