I happen to have some games I loved to play a while back that I didn't see listed on this site if you're interested in them. There are 3 games I can share atm:
The Human Calculator: Take the Mystery out of Math
Publisher: Compton's New Media
Date: 1993
Type: Educational
Description: A game where you go on an adventure through four different areas. Each area pertains to a particular subject (castle of addition for example) and gives you lessons to help prepare you for the math problems you'll encounter.
Memphis Math: Treasure of the Tombs
(will try to get a screenshot later)
Publisher: Novell
Date: 1995
Type: Educational
Description: This game helps with math as well, but it also gives you a bit of history concerning objects found in egypt. It has the feel of an Indian Jones adventure as you travel around 3 locations in egypt, going from room to room inside famous locations to search for items, solve math problems, and attempt to find a secret treasure room.
Mr PiBB 3D Interactive Game
Publisher: Brand Games
Date: 1998
Type: FPS
Description: Basically, your locked inside your school as Mr. PiBB and your fellow classmates and teachers were turned into zombies. You have to go around belching at them in order to transform them back (don't really see how that makes sense) and search for items that help you progress farther into the game. Ultimately, you need to find the evil scientist that turned everyone into zombies and confront him.