It started as fork of Zippy. It changed very much since then. You can download the binary as part of graalvm. It's not yet open source, but it will be. It's just not ready yet.

I've been watching zippy for a while, unfortunately it relies heavily on Jython which is dead. Would be very interested to see progress on this! (And maybe contribute as well!)

I'm sure you will hear about us when we go open source with Python.