На форуме конструктора игр Silent Walk FPS Creator нашел такую вот тему про OmniGM. Этот проект делается по Silent Walk FPS Creator 1.2.  Особености: 
 
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-Based on OGRE 
 -Q3Map2 based BSP/map compiler 
 -OpenGL Renderer - For portability 
 -Bump Mapping - Maybe Parallax? 
 -Water Reflection/Refraction 
 -Dual map editing 
 -Complete GPLv2 Licensed Code Base - So you can add thing yourself 
 -Field of View. 
 -Bloom 
 -Megatexture technology - Thanks to John Carmack's innovations in texturing. 
 -Dynamic Shadows - Much like Doom 3 
 -Binary Space Partitioning - Google it 
 -Sky Boxes and Spheres 
 -Multiplayer modes - I'm not too sure about this one 
 -Not limited to FPS games