A free program for Android, by Block Box Master.

In Block Box Master Diamond, you can explore a 3D open world where you can build your own constructions. There are blocks of various types that you can pick up and place anywhere you like, so you can build whatever you like.

It is your task to make your constructions as functional as possible. You will need to gather resources which is unlimited. You can use a variety of different blocks to build things and you can construct anything using a range of various pixel cubes.