Zandvox is an alternative approach to building a voxel-based world simulator in which users can bring their imaginations to life. It is infinitely extensible by design, and has been built from the beginning with community driven modpacks in mind. The ultimate goal of this project is to push the limits of what is possible in a voxel-based environment, and to make that task as easy as possible on the end user. Currently, the game ships with a world editor, "avatar" mode, character designer, a wide array of block types - including electrical components that can be miniaturized into integrated circuits.
Feel free to follow me on tumblr for updates - http://wolfgangmeyers.tumblr.com/
Have questions? Want to provide feedback? Check out the Zandvox forums - http://w11.zetaboards.com/Zandvox/index/
If you're really curious, you can get the source code here - https://bitbucket.org/wolfgang_meyers/zandvox
I've made this project freely available (free as in beer and free as in speech), but if you feel like donating... I accept: