An undertale fangame engine built in java, which supports multiple programming languages.
Here's a list of everything currently supported:
-Java
-Groovy
-Kotlin (I think, I don't have much of a way to test this one)
And I plan to support
-LUA (which caused me to make this, because I don't like LUA)
-Python (which will likely require me to make my own interpreter because Jython is wierd and doesn't work properly afaik)
This will probably always be at least slightly worse than unitale/cyf, but hey. At least I don't need LUA.
CYF: https://github.com/RhenaudTheLukark/CreateYourFrisk/releases
Unitale: https://www.reddit.com/r/Unitale/wiki/ref#wiki_how_do_i_get_the_engine.3F