OpenGl accelerators

Where can i find informations on companies developing drivers for OpenGl accelerators.
I need drivers for Nvidia chips for Vxworks.

Is there any free Open GL implementation , which can be ported for VXworks.

Please Help

I think that nvidia is the only company that do drivers for nvidia cards. They do not release enough information so nobody else can do a driver.

Drivers for windows and linux can be downloaded from their site.

IS there any Driver support for VXWorks for ATI Graphic cards