Simulation

CorsixTH

Open source clone of Theme Hospital

Visa

Endless Sky

Space exploration and combat game

Visa

FlightGear

A free and highly sophisticated flight simulator

Visa

Julius

Julius is an open source re-implementation of Caesar III

Visa

Minetest

Multiplayer infinite-world block sandbox game

Visa

OpenRCT2

A construction and management simulation video game that simulates amusement park management

Visa

OpenTTD

A highly detailed transport simulation game

Visa

Powder Toy

Physics sandbox game

Visa

Search and Rescue II

Rescue Helicopter Simulator

Visa

Taigo

Taigo is a virtual pet for your desktop

Visa

Voxelands

The Fun-Focused Free Software Voxel World Game

Visa