The Citrus Engine is a professional-grade, scalable Flash game engine built for industry-quality games. It is built upon modern Flash programming practices, allowing you to focus on making your game awesome! It comes built-in with a "platformer" starter-kit, which you can use to easily make awesome 2D or 3D sidescrolling games.
While developing AndEngine was a lot of fun, it also also consumed many(!) months of my life. It actually continues to cost me a significant amount of money to host the AndEngine forums.
PlayN is a cross-platform Java game development library written in Java that targets HTML5 browsers (via GWT), desktop JVMs, Android and iOS devices.
Pure2D is a free and open source Game Engine for Android. It's designed for Android OS and built on top of OpenGL-ES v1.x. Pure2D provides a powerful API set and amazing performance.
LiquidFun is a 2D physics engine for games. Go to our landing page to browse our documentation and see some examples.
An easy open source Android Native Game FrameWork