Grit Game Engine - The Grit Game Engine is an MIT-Licensed Open Source Game Engine that is highly scriptable via Lua.
VC Starter Kit - Everything you need to look like a Venture Capitalist
Pygame - Pygame is a set of Python modules designed for writing games.
SmartWindows.app - Auto arrange all your app windows, whether on one screen or many with a single click!
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
PingPoint - Never miss a Mark Zuckerberg signup to your app ever again