Other than MEdit, I've created a simple Windows egg timer program, to remind me to take breaks from the computer every once in a while. The software works fine, but I wasn't very obedient, so it said I have to give it away for free. The program is very simple—all it does is count down from whatever number you set, and allows you to pause it if you want. A unique feature is that you can enter 99 minutes, and it figures out that you mean 1 hour, 39 minutes. You can also have it save a CVS-delimited spreadsheet file of your times, for record-keeping purposes.
If I ever get back to it, I'll add a fractal browser that was created when I was learning to make software. It isn't yet professional enough to share here.