One-Commands are creations that can be installed into a vanilla minecraft world, and will change the way the game works. Sortof like modding, but without mods! Installation is easy, a simple click or block placement and it's done! Here is a list of all the ones I've made so far.
Go and Collect all 41 NEW Achievements that this Command adds to your Game!
Tinkers' Construct can Create a Smeltery that Doubles ores, and Add's new and Powerful Tools!