- Jython (python 2.7 support) - Curseforge (Mirror)
- JEP (python 3.x support) - Curseforge (Mirror)
- Lua (lua 5.2 support) - Curseforge (Mirror)
- Ruby (Ruby 2.5.x support) - Curseforge (Mirror)
Jython and Lua will have a good performance benefit for most tasks. Plus, their threading scheme for launguage contexts works better, so you can have true async. JEP's good until you try to access a lot of different Java objects.
for debugger attaching in js, see JsMacros Debugging