<br /> CEGUI<br /> Crazy Eddie's GUI System is a cross platform free library providing windowing and widgets. (MIT license)<br />

<br /> MyGUI<br /> Fast and simple GUI. (MIT license)<br />

<br /> MOGRE<br /> Managed OGRE is an advanced .NET wrapper for OGRE. The "glue" code between C++ and .NET is developed using C++/CLI, which offers great flexibility and low-level control. (LGPL license)<br />

<br /> OgreOggSound<br /> wrapper for OpenAL. (MIT license)<br />

<br /> Caelum<br /> Creates nice-looking atmospheric effects such as sky colour, clouds and weather phenomena such as rain or snow. (LGPL license)<br />

<br /> Particle Universe plugin<br /> Particle plugin with more features and possibilities than Ogres' built-in particle plugin. (commercial license)<br />

<br /> PagedGeometry Engine<br /> Real-time rendering of vast, dense forests with trees, grass, etc. (Zlib license)<br />

<br /> Berkelium<br /> Renders a Google Chrome browser inside Ogre. Supports flash. (BSD licence)<br />

<br /> OgreBullet<br /> a wrapper for the Bullet Physics Engine. (MIT license) <br />

<br /> OgrePhysX<br /> a wrapper for the PhysX Engine. (LGPL license) <br />