An easy to use managed graphics engine.
Edit by : An easy to use managed graphics engine. Utilises OpenGL, Direct3D9, and Xna through an Abstraction Layer. Accompanied by a number of other helpfull tools, for example to simplify input and networking.

General:

Takes full advantage of the NET framework for a significant Boost to productivity with insignificant loss of performance.
Support for either OpenGL or Direct3D9.
Runs in Windows, Linux, and Mac OS X without use of plugins or rebuilding from source.
Graphics code is divided into two sections: a thin, abstract wrapper around rendering systems, and an engine built on top of the wrapper. The wrapper can be used independently of the engine.
Capabilities:

Truetype bitmap fonts (soon outline fonts as well) (Win32 only).
Multiple window rendering (Win32 only).
Dynamic textures.
Multitexturing.
Normal mapping.
Rudimentary shader support (under development).
Loading and animating Quake 2 md2 files.
Hierarchy of scene nodes to which objects are attached. Child nodes and their attached objects are transformed relative to the parent node.
A rudimentary particle system that will form the basis for a more sophisticated, pluggable one.
In Planning:

Improved resource management.
Depth sorting of nonopaque objects.
Planar and volume shadows.
Skeletal animation and loading of Quake 3 md3 files.
Cube mapping and environment mapping.
Much more! you can free download Facilis Engine 0.2.4a now.