Binary tree generator. No, not the data structure, but an artistic representation of a binary tree (edit: I have learned that this kind of thing is called an L-system). The swf can be found here or embedded in the full post. Click the button on the bottom left to randomly generate a new tree. I’ve also uploaded the source FLA file here. I didn’t really bother to optimize the code, so there are probably a lot of improvements that could be made.
Note: The FLA file is saved in Macromedia Flash Professional 8 format, with Actionscript 2.0. It’s a pretty old version of Flash, so it should be openable by any of the Adobe versions of Flash as well.