I have a project I'm working on that requires me to illustrate some binary search trees and red-black trees. I've done a lot of searching, but I can't seem to find a piece of software that can do the drawing for me. Mainly something that can place the nodes of the tree in a presentable manner (i.e. does all the measuring and placement for you). I'm not looking for something to figure out the manipulation of the trees, just something to assist me in drawing it.