Walk around, dig and build in an infinite voxel world and craft stuff from raw materials to help you along the way.
Multiplayer without lags support for tens of players, via servers hosted by users.
Almost infinite world and a fairly good map generator.
Unique real liquid dynamics.
Market link: org.freeminer.freeminer
Web site: http://freeminer.org/
Market downloads: 10,000-50,000
Market rating: 3.2 / 5.0