One Roll Engine. Wild Talents is the most easily available game using ORE. I mentioned it earlier because I think it's a neat system. However, it's also a bit tricky to build powers for until you get used to it.
I'll be unavailable for the next few days as Thursday marks the start of the annual BOGA game retreat when I will be playing boardgames all day long and not doing online stuff at all. I will return either Sunday night or Monday morning