I'm still figuring out which sim I'm going to race with but I've got Assetto Corsa, Project Cars I & II, Dirt Rally, Dirt 4, and F1 2017. I've been sticking to older classic titles since I still don't have a GPU yet. I used to play Gran Turismo and NFS a lot on my PS1 and PS2 back in the day. Lately it's been Mario Kart on the 2DS.
City Builders are mainly Cities Skylines (huge time sink). But I also have quite a bit of time in on Dorf Romantik lately and Kingdoms and Castles. I've been messing around with Islanders a little bit too but Dorf seems to be the one I play most lately. Kingdoms and Castles is kind of fun, but I think I need to move to hard mode since I just spend way too much time building giant island sized forts. I have Surviving Mars too but haven't played it yet.