The program used in class to demonstrate counting in binary was written in Visual Basic, and runs only on Windows. (It would be pretty easy to recreate it in Javascript, an exercise left for the interested student.)
Here's the executable (.exe) file bincount.exe.
The Visual Basic source. It's just text; the part that does the work is at the end, so scroll down.
The VB project file if you want to recreate it; you have to be on a system that has VB (OIT cluster machines, for example).