I always play around with map editors for games.

One of my favorite was Starcraft. It allowed you to make really great maps, and even entire campaigns if you wanted.

When the map editor is easy to use, I make maps. I made maps for Age of Empires 2, Star Wars Galactic Battlegrounds, Starcraft, Submarine Titans and I tried for Unreal Tournament, but it was too hard.

I made some pretty cool maps for StarCraft: Brood War, I made a whole campaign too (only 5 maps but hell, better than nothing :D ).
Sadly all my self-designed maps got lost in the latest system crash...
OH MAN HOW DO I HATE WINDOW$!!!! :rant:

*goes to make a backup of entire HDD*

I also made a whole campaign for broodwar! ^_^ It had 30 levels(if not more) and you had lots of choises to make(like disobey orders or obey orders...ect). And if you choose the wrong one you can lose(finish the game but according to the story you'll lose),fall for a trap,lose a valuble ally...ect :)

Sounds interesting. Do you still have the files for it?

Age of Kings: Conquerors expansion, Warcraft 3: Frozen Throne, Age of Mythology... Civilization 2 gold, Civ3 with Conquests and Play the World, Colonization...

Age of Empires I and II (Made two full, terrible campaigns for the first one), Empire Earth (A tiny bit) and uh... 4-D Sports Driving :P
I don't know. Does this also include things like Operation Flashpoint and Morrowind? Propably not...

Everything for personal use.
Except one Stunts track :P

Anything that has an editor I make maps for.
And if it doesn't I go get a unnofficial one.
I've been making maps for Half Life, Starcraft, Doom, Homeworld, Unreal, Age of Empires 2, etc.