SDL Framework (SDLFW)
SDLFW is a cross-platform framework from the powerful SDL library to create your own 2D games with the Lua programming language.
It's easy-to-use, free, open-source, and works on Windows and Linux.
Live Security/Forensics Linux Distribution, built from scratch and packed full of tools useful for vulnerability analysis, penetration tests, and forensic analysis.
Glogo is a software project to develop a crossplatform, standards compliant 3D desktop GUI and multiuser networking environment. If you're familliar with William Gibson's Neuromancer or Neal Stephenson's Snow Crash, then you get it. Coders needed!