The Rigel Project (rigelproject.github.com)

The Rigel project is a simulator + tool chain for a machine with 1000+ cores. The aim is to develop the chip as well as a low level software stack that would make it suitable for development.

I am not currently associated with the project but i did do some research on it when i was at UIUC. I was trying to make a small cooperative scheduler run on it and evaluate different scheduling strategies