Holy crap there are a lot of sheets. I started looking at the lengthy list in the menu and soon discovered that isn't an exhaustive list.....it is just a list of systems he has sheets for.
For example, if you check out the 1st Edition AD&D sheet, it is actually a collection of seven different sheets...
If you poke around a bit you are bound to find a few goodies....I especially like the Top Secret database. I don't play Top Secret (but I want to), but I can only imaging how useful having that information would be if you were running a game.
Now it looks like he hasn't had an update since 2011, but the site is up and if you are playing a game that came out earlier than that I suggest taking a look and seeing if there is something you can use.