Crytek today released its graphics analysis tool Renderdoc.

Renderdoc (as I understand it) lets you grab frames from any Windows apps that use Direct3D 11.0 or 11.1. You can then analyze them for glitches and performance.

Apparently it doesn't support OpenGL yet, so it's maybe not immediately useful for Limit Theory. But Crytek are talking about adding that In The Future, so this might be worth watching.

The source code for Crytek's Renderdoc is now available at GitHub.