A series of free tools for modern video graphic cards: info, monitoring, tests, overclocking etc…
benchmark:
3DMark maybe the most famous benchmark software based on DirectX
ComputeMark the first available software for DirectX 11 testing
Heaven benchmark based on the advanced Unigine engine, supports DirectX 9, 10, 11 and OpenGL 4.0
FurMark OpenGL benchmark
FluidMark Nvidia PhysX and OpenGL benchmark
gluxMark 2 specific for OpenGL
GPCBenchmark evaluates the performance of OpenCL enabled devices with a collection of several algorithms and applications
various utilities:
GPU-Z famous utility video cards information
GPU Caps Viewer OpenGL and OpenCL info utility
NVIDIA Inspector specific utility for Nvidia graphic cards, info and overclocking features
EVGA Scanner info, stress test and benchmarks etc…
GPU shark gpu monitor utility