• Boo for code, OpenTK for platform, Python for scripting
• Forward-compatible OpenGL-3 context
• Simple spatial system (wiki)
• Configurable rendering pipeline (wiki)
• Meta-material system (wiki)
• No matrix operations (wiki)
• Universal key-frame animation system (wiki, post)
• Blender exporter to native format (wiki)
• Gtk#-based scene viewer (wiki, post)
• Gamma-correct rendering
• Basic OpenAL 3D sound

Purely GPU features:

• Render-independent skinning & morphing (wiki, video)
• Behavior-based particle engine (wiki, post, video)
• Hair engine (article, post, video)
• Hierarchical depth-culling and bounding box management (post)

Side Features:

• Universal lightning and shadowing
• Blender-style deferred textures pipeline (post)
• Generators: cube, sphere, landscape, simplex noise
• Animation graph, render scheduler
• Various deferred renders (post, video-dude)
• Anaglyph stereoscopic rendering

In development:

• Node-based material construction
• Global Illumination approximations
• Physics engine integration
• Texture animations
• GPU cloth simulation

Any questions? Contact me: kvarkus on google