For some slightly less common games: Golf with your friends is a great mini game to play, effectively really crazy golf online
From the Depths build ships/planes/tanks with entirely custom guns, engines etc. then play on the campaign map with fleets of these ships. you can make some really complicated vehicles if that's your thing. Unlimited player count as far as I'm aware.
A less deep version of that is Avorion - Mine resources to build custom ships (less complicated) then even small fleets and do quests, make allies/enemies as you venture to the centre of the galaxy. Supports unlimited players as far as I'm aware. It also allows you to form an alliance to share resources with other players. Resource gathering (mining/salvaging) can be automated by your fleets if that's not your thing.
Just a book series for now (the film rights for various series keep getting bought, then expiring) Worth a read!