Planet Explorers is a voxel-based, open-world adventure RPG currently in production by Pathea Games.
You will be able to craft items, build buildings, and even edit the terrain. The game will release with single player at the start but the developers have stated they expect to have multiplayer added before the true release. The game released it's 1.0 build on November 8th, 2016.
The game released an open alpha build of the game on June 26th 2012.