Cocos2d-x is an open-source and cross platform open source free 2D game engine for mobile game development known for its speed, stability, and easy of use.
License: Open Source
Cocos2d-x is a versatile game development framework that supports both 2D and 3D games with extensive features and strong community support, making it suitable for complex projects. Blitz3D, on the other hand, is focused primarily on 3D game development with an easier learning curve, but it lacks the depth and flexibility of Cocos2d-x for 2D games and advanced features.