I thought with blender using only opengl this could interest some of you. mind you need a dx11 type graphics card to be able to use opengl 4.
opengl 4.0 has really stepped it up with the same feature set as dx11 in particular, compute shaders and tessellation.
opengl 4.0 vs dx11 test
http://www.geeks3d.com/20100527/test-opengl-4-0-and-direct3d-11-tessellation-gtx-480-vs-gtx-470-vs-hd-5870-vs-hd-5770/
opengl 4.1 includes even more then dx11