Mersenne Twisters in OpenCL by Jay Cornwall
Introductory Tutorial to OpenCL by B.R. Gaster, AMD. Uses the C++ wrapper around OpenCL.
NVIDIA OpenCL conformant release for NVIDIA graphic cards.
ATI Stream supporting x86 processors as OpenCL devices (32 and 64 bits).
C++ wrapper can be found on the Khronos OpenCL page.
The Open Toolkit provides .NET wrapper (C#, etc.).
Ruby-OpenCL provides a Ruby wrapper for OpenCL.