Possible Games:

• https://catanuniverse.com/game/ (Browser-based, free)
• https://boardgamearena.com/ (Browser-based, 4EUR/month)
• https://www.yucata.de/en/ (Free)
• https://tabletopia.com/ (Free trial)
• Cards against humanity online: https://allbad.cards/how-to-play
• https://really.boring.website/lobby

Game 1: we are playing Pandemic: Hot Zone https://tabletopia.com/games/pandemic-north-america

Conclusion: very nice interface (represent a physical board game, you can grab your pawn and pick up cards, etc), and Pandemic is fun to play.