Jython is still hanging in there, and reached 2.7 this year. I imagine 3.x compatibility is going to require a big effort though. But JRuby has way more moment

Jython is still hanging in there, and reached 2.7 this year. I imagine 3.x compatibility is going to require a big effort though. But JRuby has way more momentum and a much larger userbase. But on the .NET side, IronPython is still ticking along while IronRuby is dead.