et-engine

Cross-platform engine + framework, written on C++. One code for all platforms.

Supported platforms:

iOS;
OS X;
Windows;
Android (still porting);

Features:

wrappers for OpenGL and OpenGL ES objects;
own GUI system (with multilingual support);
own math library, similar to GLM and based on GLSL object naming convention;
multithreading support;
sound engine;
gesture recognizers;
collision test routines;
support for PNG, JPG, DDS, PVR with asynchronous loading;
locales support;
FBX importer (using FBX SDK);
basic primitive generation;
basic scene graph with serialization support;
LOD based terrain;

Platform-specific features:

iOS specific features and wrappers: IAPs, MessageUI, CoreLocation, CoreMotion, UIImagePickerContorller, AVCaptureSession and other;
touchpad support in OS X;
3rd-party wrappers: Chartboost;
easy integration into Cocos2D-iphone or native iOS application.

Tools:

texture atlas generator;
FBX converter to native format;
font generator.