AFAICT it's not actually published yet? It's a bit of a confusing situation because you can "download Rama" but it's not "full", whatever that means. See https://redplanetlabs.com/learn-rama
E: this download has "the full Rama API for use in simulated clusters within a single process", but also "Rama is currently available in a private beta." That's a highly unusual way to release what appears to be a Java library at the end of the day, but hopefully that's because it's unusually awesome! Looking forward to actual info some time in the future. I wonder if the "private beta" costs money...