The RobotOpen platform is alive and well...our Gorgon controller is a third generation device based on Arduino.
http://www.andymark.com/product-p/am-2900.htm
It isn't the newest freshest flavor of whatever is available in the market, but that's part of its charm. Arduino is widely supported and very easy to interface with.
The integrated driver station and use of gamepads makes it very similar to FRC style setups and it supports the normal suite of sensors you might use for typical mobile applications.
Bets of all you get integrated pneumatics solenoid drivers!!
We use it all the time for internal projects and really love it.
