WorldCraft

WorldCraft is a construction and exploration game, practically identical to Minecraft, in which you can create your own virtual world block by block - and even share it with other players over the Internet.

In one-player mode, WorldCraft gives you the choice between Minecraft's famous creative mode (in which you have unlimited resources and can concentrate on building) and survival mode, which provides a much bigger challenge.

In multiplayer, however, WorldCraft only has creative mode available, which means that you can team up with your friends to create large buildings and architectural feats.

Graphically speaking, WorldCraft is practically identical to Minecraft, with everything based in blocks which, despite their low-resolution textures, are quite nice.

WorldCraft is an excellent free clone of Minecraft that gives you practically everything offered in the original game without asking for a cent in return.