My plan is to make a handy and unlimited Minecraft editor that can be used on very large worlds for copy/paste operations and terraforming. I have a few hours a week to work on this, mostly on the evenings and weekends until I get a girlfriend or some other disaster happens. Once it’s not fun anymore, or I can’t continue, I will release the source code as public domain except some commercial libraries developed at my workplace. (There’s a chance for these libraries will be released too under GPL or an other open source license.)