I've never worked with it myself, but Appsmith (appsmith.com) seems like a promising alternative to Retool.

This is really a fun library to play with! :)

I've just written a little post about using Rant in Python if someone doesn't want to go into C#.

https://kleiber.me/blog/2019/02/08/quick-tip-text-generation...

Excellent post, I was looking for something in python.