OpenTTD - An open-source clone of the classic game ...
Dwarf Fortress - Dwarf Fortress is a single-player fantasy game with two modes: fortress and adventure.
Game Dev Tycoon - Game Dev Tycoon is an addictive, Strategy, Business Simulation, and Single-player video game developed and published by Greenheart Games.
RimWorld - RimWorld - A sci-fi colony sim driven by an intelligent AI storyteller.
RollerCoaster Tycoon Classic - Create and run amazing parks on your iPhone or Android.
Terraria - Dig, Fight, Build! The very world is at your fingertips as you fight for survival, fortune, and glory.