Sparrow, open source game engine for iOS
Sparrow is a library based on pure Objective-C that provides an intuitive and easy to grasp API.
It is developed by the same team that created their other engine, called Starling (sharing the same concepts and naming rules) and is based on OpenGL for rendering the graphics. There are a pretty decent amount of 2D games created with this engine but the community is not that active anymore these days.
- OpenGL ES 2.0 support
- Allows developers to add their own fragment and vertex shaders and extend its capabilities
- Can be integrated with the UIKit framework
- Direct access to access iOS APIs