Yeah, it has been there for quite some time, but has really started getting off the ground in about mid-late 2019 which is strange, since like you mentioned, the advent of TS. But slowly a lot of interest has been brewing over it, it's growing faster than ever, and has been attracting users/contributors a LOT only since the start of last year.
https://academy.cs.cmu.edu/
This is Carnegie Mellon's academy website, running on Brython. See the Brython Wiki page on their GitHub, they got a list there.