+1 for DCS World
+1 for Rise of Flight
IL2: Cliffs of Dover with the Team Fusion mods and SweetFX is very nice.
+1 for ArmA II and ArmA III
+1 for Eurotruck Simulator and American Truck Simulator, and for training to drive the big rigs, I also like Scania Truck Simulator.
+1 for OMSI 2.
IL2: Battle of Stalingrad and Battle of Moscow are both very nice if you don't mind flying Russian (or German) aircraft.
Train Simulator 2016 is amazing if you like trains and don't mind investing in DLC.
Attila: Total War is shaping up to be quite amazing. I'd also plug Shogun 2 with all the DLC.
Codemaster's F1 20XX series is uniformly great, though F1 2013 Complete Edition is the best of the lot in my opinion.
Assetto Corsa is fun if you like to drive a variety of cars on tracks all over the world.
rFactor 2 is very good.
Dirt Rally is outstanding.
NASCAR '15 Victory Edition is a solid entry if you like to stand on it and turn left.
Automobilista is also great.
Wreckfest is a lot of fun is you're into the local track/demo derby type stuff.
Steel Beasts Pro PE is probably the best thing on tanks, though it is looking a little dated.
Prepar3D is very good if you like General Aviation.
And of course, the Silent Hunter series and all that, but if you're here, I'm assuming you know all that.
