What cool programs have you built just for fun?

I'm currently making a dungeon crawler in javascript. I've made several games using Game Maker, but they aren't that good and have to be downloading as an exe. I've joined a programming group, and hopefully we can churn out a few good games.

Well in my college year i use visual basic 6.0 to make an accounting program. At first it was fun, but after a while it become complicated and stress me out. But at last i finish it. And then when i c some software competion is being held at my Campus, i just sign up for it just to test how well people will receive my program. In the end i became the 3rd Champion. Well at least i got some money from something i do for fun.

Back during my old school days, I used to make simple games using a software that requires no programming language called Klik N Play. I remember making a game called Space Invader where my little brother had so much fun with it. I also made a simple program where you can decorate your house by changing its door color, roof, windows etc using Macromedia Director (now known as Adobe Director). Those were programmed using Lingo and its quite simple to learn Lingo. These days, in my college life, I don't have much spare time to do any of those anymore. However I still managed to make cool presentations using Adobe Flash. Flash is a good alternative to MS Powerpoint and can avoid your presentation from looking dull & boring.