Worth mentioning that Pavlov, Assetto Corsa, and Vox Machinae are all on sale now and are being hosted in the thread pretty regularly if you're looking for multiplayer stuff to play.
https://store.steampowered.com/app/555160/Pavlov_VR/
https://store.steampowered.com/app/334540/Vox_Machinae/
https://store.steampowered.com/app/244210/Assetto_Corsa/

There's also Payday 2, which I think was being hosted in the steam group or something.
https://store.steampowered.com/app/218620/PAYDAY_2/