A powerful and simple library to open issues on GitHub directly from your app.
Hipster4j is a lightweight and powerful heuristic search library for Java and Android. It contains common, fully customizable algorithms such as Dijkstra, A* (A-Star), DFS, BFS, Bellman-Ford and more.
A simple but powerful product-key generator written in Java.
A powerful and lightweight plugin framework for Android
Simple yet powerful CAPTCHA library written in Java. Original source at http://code.google.com/p/patchca/
Powerful interception library that lets you at runtime change the behavior of objects and classes
A simple but powerful View controller for GWT
Rapidoid - Extremely Fast, Simple and Powerful Java Web Framework and HTTP Server!
The Most Powerful Swipe Layout!