Best F2P Simulator Games?

I'm looking to play some Simulator games again lol. Any recommendations?

i would say planetside2 for my opinion
and good second is Generals And Heroes, but they have too bad support and if you get banned for no good reason, they wount unban you.. i got ban for username as "Gh0st" it was too much for them....i had spend money on that account nearly 200euros and suddenly ban...