1. Masquerademasquerade is the predecessor of masq: https://github.com/dennisreimann/masq - please consider using masq from now on, as it is the more modular approach.
2. IoctocatiOctocat v1 - GitHub for iOS (works on the iPhone, iPad, and iPod Touch)
3. MasqMountable Rails engine that provides OpenID server/identity provider functionality
4. CodeshelverCodeshelver lets you clean up your GitHub watchlist by storing repositories you would like to remember on your shelf.