Board game arena has a lot of games from classics to modern hobbyist games.
A couple years old, hopefully most of the websites on here are still alive:
https://drive.google.com/file/d/1NO-05LM-SakbwqNajBXgIO4HuCSkBd6n/view https://alinachin.github.io/onlineboardgames.html
Tabletopia has an app on iOS and is pretty slick online. We used it during the pandemic to play with my parents across the states.