XMind

XMind is now royalty-free and open source software. This means when you want to use an XMind fishbone in a spreadsheet, put your photos and media files into a mind map, or reuse your Freemind/MindManager files, you're free to use XMind without charge. You can even add XMind or XMind Pro as plug-ins into your Eclipse-based enterprise environment.

Robocode

http://robocode.sourceforge.net/

UFO: Alien Invasion is a strategy game featuring tactical combat against hostile alien forces which are about to infiltrate earth at this very moment. You are in command of a small special unit which has been founded to face the alien strike force. To be successful on the long run, you will also have to have a research team study the aliens and their technologies in order to learn as much as possible about their technology, their goals and the aliens themselves.

Spring Engine

Spring is a project aiming to create a new and versatile RTS Engine.