Minetest - Minetest is a near-infinite-world block sandbox game and a game engine, inspired by InfiniMiner...
Project Anarchy - Project Anarchy is a complete end to end game engine and state-of-the-art toolset for mobile.
Minecraft - A block-building game that allows you to create and explore entire worlds from scratch.
Limon Engine - Limon is a multi platform 3D game engine mainly focusing on first person games.
Terasology - Terasology (started under the name Blockmania) is an open source project started by Benjamin...
Struckd - 3D Game Creator - Struckd is the next-generation gaming platform for user created content where people of all ages...