So as to avoid unnecessary confusion, I've renamed the projects title to Manic Digger : Open Source. I hope that this highlights that while this games initial design is similar to other projects, this game is open source and free to play.
Its community is as much a part of the development team as it is the player base. Those that can see the potential this game has are eager to see this project take off and we enjoy playing simply as it is such a wonderful genre of game to potter about in.