A full fledged Tiddlywiki + KaTeX is introduced to me by 8d1h.
Unfortunately there is no about or author information to see who is behind this amazing Tiddlywiki!
https://mathematik.tiddlyspot.com/#
I highly recommend to visit and download it as a wonderful TW example for scientific application!
See also (KaTeX in Tiddlywiki Showcases)