Exambuff - Open Sourced Startup
This is the entire source code and documentation to a startup I attempted in 2008-2010. Please feel free to take it an make your fortune :)
Documents (docs.zip, design.zip) are under the Creative Commons Attribution 3.0 Unported License, so beyond not passing the original work off as your own, there's no limit to what you can do.
Software (/src) is under the MIT license (/src/license.md). Let me know if you need it under another one.
More in this article - http://truffles.me.uk/exambuff-open-sourced-startup