OGRE (Object-Oriented Graphics Rendering Engine) is a scene-oriented, flexible 3D engine written in C++ designed to make it easier and more intuitive for developers to produce games and demos utilising 3D hardware. The class library abstracts all the details of using the underlying system libraries like Direct3D and OpenGL and provides an interface based on world objects and other intuitive classes.
The current CI status on github is Ubuntu/ OSX/ Android/ iOS 
- What's New?
A summary of the new and altered features in this release. - Features
A summary of OGRE's main features. - Building the core OGRE libraries
If you're using the full source release, this will help you build it. If you're using a precompiled SDK then most of the work has already been done for you, and you should use the sample projects to see how to compile your own code against OGRE. - The OGRE Manual
A high-level guide to the major parts of the engine and script reference. - API Reference
The full OGRE API documentation, as generated from the (heavily!) commented source. - The OGRE Wiki
A gold mine of tutorials, tips and code snippets which will help you get up to speed with the engine.
We welcome all contributions to OGRE, be that new plugins, bugfixes, extensions, tutorials, documentation, example applications, artwork or pretty much anything else! If you would like to contribute to the development of OGRE, please create a pull request on bitbucket or github.
Please use our community support forums if you need help or think you may have found a bug.
Please see the full license documentation for details.