Jus is a flexible and easy HTTP/REST client library for Java and Android.
AndResGuard is a tool to proguard resource for Android, just like ProGuard in Java. It can change res/drawable/wechat to r/d/a, and rename the resource file wechat.png to a.png. Finally, it repackages the apk with 7zip, which can reduce the package size obviously.
A Powerful Android Content Provider ORM. It uses Content Providers to access the data and internally uses SQLite to actually store the data. It can be used as a typical ORM, by creating Java objects and applying some Annotations and/or by extending QuantumFluxRecord on them and they will be accessed normally and creates ContentProvider.