Minecraft is sandbox world building game currently owned by Microsoft.

Simutrans is a cross-platform simulation game in which the player strives to run a successful transport system by constructing and managing transportation sys…

TrackMania (series) is a custom track building racing game.

OpenTTD is an open source simulator based on the classic game Transport Tycoon Deluxe. It attempts to mimic the original game as closely as possible.

Kerbal Space Program (KSP) is a space flight simulation video game.

CorsixTH is an Open source clone of Theme Hospital.