Nilium #1 Not sure if this will work for games, but I just found it on the Cipher fora so I'm posting it here too in case anyone might want to take a look at it.http://arbaro.sourceforge.net/
Leadwerks #2 I managed to get some low-poly trees out of this using a recursion level of 2, and lowering the smooth setting to 0.0.This makes very good trunks, but you still need to add masked sprites to make leaves and smaller branches.