OpenTTD - all time favorite. Open source version of excellent game - Transport Tycoon Deluxe (there is open rollercoaster tycoon 2 for those who like building amusement parks)
Factorio - Overall very fun to watch and play game
Teamfight Tactics - Autochess genre is pretty fun
Long time ago, CS1.6 - KZ maps, where you jump :)
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