Muck is described as 'survival-roguelike. Collect resources, find items &amp; build a base to survive for as long as you can.Collect resources, craft tools, weapons, & armor, find items & build your base during day'. There are more than 50 games similar to Muck for a variety of platforms, including Windows, Mac, Android, Linux and Steam. The best alternative is Minecraft. It's not free, so if you're looking for a free alternative, you could try Minetest or Veloren. Other Muck like games are Creativerse (Freemium), LEGO Worlds (Paid), MineClone 2 (Free, Open Source) and Hytale (Free).
Minecraft is a sandbox game that revolves around using building blocks to create anything you want. At night, monsters come out; make sure to build a shelter before that happens. The game also has multiplayer capabilities.
Terasology (started under the name Blockmania) is an open source project started by Benjamin “begla” Glatzel to research procedural terrain generation and efficient rendering techniques in Java using the LWJGL.
Eco is an online game where players must collaborate to build a civilization in a world where everything they do affects the environment. All resources come from a simulated ecosystem, with thousands of plants and animals simulating 24/7.