Widelands is RTS (real-time strategy) game for Linux, macOS and Windows. It is a free RTS game and released under open source GPL v2+ license. You need OpenGL version 2.1 or higher to run this game. It comes with singleplayer campaigns and a multiplayer mode. In this game you need to build a settlement, produce resources and train soldiers to attack enemy. you can choose from Barbarians, Empire, Atlanteans, and Frisians tribes. This game was inspired by blue byte software’s Settlers II RTS game. This game is still under heavy development.