
https://www.tabletopsimulator.com/
Buy and Download the client software in Steam.
Your Steam account is your user account in Tabletop Simulator.
Some games are included and a wide array are available from the Steam Workshop.
Professional DLC for some games if also available for a price.
The software gives you a 3D board and pieces, even a table to flip
Not all games have rules enforcement or even turn enforcement (scripting in the parlance of the software).
Solo games option but no AI opponents.
Live play, with save and continue option, so in theory could be played turn by turn (but no "your turn" notifications).
"Hotseat" play option so players can share a screen.
Also available in VR via Steam!
An image of a smattering of the 30,000+ games in the Workshop (many repeats and language versions).
And a link to the full list in Steam: https://steamcommunity.com/workshop/browse/?appid=286160&browsesort=trend§ion=readytouseitems&days=90