OpenTTD - An open-source clone of the classic game ...
Banished - As always, Email support (at) shiningrocksoftware (dot) com if you have any issues. This will likely be the last update of Banished, except for any major bug fixes. The OSX and Linux versions development has stopped, and won't be released.
Transport Fever - Transport Fever is an Adventure-based, Management, Strategy, Economy, Sandbox, City-Building and Single-player video game developed by Urban Games and published by Gambitious Digital Entertainment.
RimWorld - RimWorld - A sci-fi colony sim driven by an intelligent AI storyteller.
Transport Tycoon Deluxe - Transport Tycoon Deluxe is a Business Simulation developed by Chris Sawyer and published by MicroProse.
Dwarf Fortress - Dwarf Fortress is a single-player fantasy game with two modes: fortress and adventure.