I wondered the same thing a while ago, wanting to do so for my own purposes. I found this a while back. http://www.gamedev.net/topic/623145-terrain-generation

I wondered the same thing a while ago, wanting to do so for my own purposes. I found this a while back. http://www.gamedev.net/topic/623145-terrain-generation-with-plate-tectonics/ http://www.gamedev.net/topic/623145-terrain-generation-with-... I'm hoping to find time to use it myself, and possible extend it. Thankfully its open source.