The built-in keys and auto-selection modes will appeal to themers and modders. The ability to sign with private keys will appeal to developers.
This app does not require root privileges.
See the website for full documentation.
Root access is needed.
If you dont have root, check out ZipSigner on the market.
This app allows you to sign any apk, zip or jar file right from your phone with any key of your choosing.
If you have any issues, please don't hesitate to contact :)