Device Year Class is an Android library that implements a simple algorithm that maps a device's RAM, CPU cores, and clock speed to the year where those combination of specs were considered high end. This allows a developer to easily modify application behavior based on the capabilities of the phone's hardware.
SQLCipher is an open source extension to SQLite that provides transparent 256-bit AES encryption of database files.
Android Donations Lib supports donations by Google Play Store, Flattr, PayPal, and Bitcoin.