Also 8th. I find the free version fun to play with as a modern desktop forth with built-in support for things like databases, odbc, json, matrices...etc. The commercial aspect won't be most people's cup of tea of course, but I still think it's neat and 8th is probably the most approachable way to write a desktop app with forth.
https://8th-dev.com/
https://8th-dev.com/manual.html