Funto

OpenGL-Timestamp-Profiler

A simple CPU/GPU OpenGL-based profiler

nanovg

Antialiased 2D vector drawing library on top of OpenGL for UI and visualizations.

StarFighter

Tohoku-Engine

Smallish 3D engine oriented toward implentation of 3D research algorithms

apitrace

Tools for tracing OpenGL, Direct3D, and other graphics APIs

S5old

libfreenect

Drivers and libraries for the Xbox Kinect device on Windows, Linux, and OS X