http://store.steampowered.com/app/227680/ (Early access to the alpha)
A next-gen sandbox experience, StarForge is a game about gathering resources, building bases, crafting anything you want, and surviving on an alien planet. Earth's star is dying and humanity transferred as much technology and resources as possible and left on a one way mission to populate another planet. StarForge was inspired by Halo, Warcraft 3, Borderlands, Terraria, and Minecraft. It borrows elements from the RTS, FPS, RPG, Voxel Builder, Tower Defense, and Physics Sandbox genres.I'm tempted to buy it, although it does look rough as. I'm sure the animation and what have you will eventually be improved on, but what REALLY gets my interest is there's supposedly seamless ground-to-space gameplay, and eventually have infinite randomly generated voxel terrain with multiplayer "survival" mode where you can take on different roles like soldier, architect, miner and trader.
Or so they say anyway...
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Voted by the community "Best mod" 2011, 2012 and 2013.