Freeciv is an open-source, turn-based strategy game based on Civilization II. Inspired by the history of human civilization, the game commences in prehistory and your mission is to lead your tribe from the stone age to the space age...
An open-source clone of the classic game 
Transport Tycoon Deluxe. It attempts to mimic the original game as closely as possible while extending it with new features.
OpenRCT2 is an open-source game engine recreation of the simulation game 
RollerCoaster Tycoon created by Chris Sawyer in 2002. OpenRCT2 uses a similar development process to .
OpenRA is an open-source reimplementation of Westwood’s 
Command & Conquer Red Alert game engine, updated to use the hardware acceleration of modern video cards using OpenGL.
shapez.io is an open source base building game inspired by factorio! Available on web & desktop - tobspr/shapez.io
An alternative to the Java web game "Minecraft Classic" that was listed on the official Minecraft site but taken down in 2016-2017.
Luanti is a near-infinite-world block sandbox game and a game engine, inspired by InfiniMiner, Minecraft, and the like.
Create complex supply chains, produce materials, and defend against enemy waves in this cross-platform sandbox tower defense game.
