TexBench is a free OpenGL synthetic texture download and texture fillrate benchmark. Source code is available at the authors site.

Main Features:
- 5 Benchmarks:

Single 2D texture

Single 3D texture

2 multi 2D textures

2 multi 2D textures and 3 texture units

2 multi 2D textures 4 texture units.

- Benchmark different texture resolution from 16x16 to 4096x4096
- Create from 1 to 200 (12GB) textures
- Benchmark under different OpenGL modes
- OpenGL driver Extensions info

Supports
- Win32
- SGI
- Linux