Minecraft
Commercial
Minecraft is sandbox world building game currently owned by Microsoft.
Garry's Mod
Commercial
Garrys Mod(GMod), is a sandbox physics game.
Mythruna
Free
Mythruna (myth + rune + a) is a game under development attempting to combine serious role-playing elements with an endless, living, and completely modifiable …
Terasology
Open Source
Terasology is an open-source Minecraft like game.
Manic Digger
Open Source
Manic Digger is a 3d block-building game, a Minecraft clone.
Minetest
Open Source
Minetest is a free, open source building game inspired by Minecraft.
Blockscape
Commercial
Blockscape is a block building game.
Voxelands
Open Source
Voxelands is a free voxel world game.
Growtopia
Freemium
Growtopia is an experimental multiplayer creative sandbox game.
Compare Roblox with alternatives
Compare Manic Digger and Roblox and decide which is most suitable for you.