I didn't use many of them but I can remember these for sure : jazz jackrabbit 2 level editor when I was 11 years old then Age of Empire (was it 1 or 2 I don't remember) map editor and of course roller coaster tycoon 1&2 :]
Was either Age of Empires 2 or Stronghold. Could tell I loved rts games :) Around that same time I started learning Basic and making text based adventures
Timesplitters 2 + 3's Map maker, spent a lot of time making dark zombie wave survival maps haha. Almost impossible to find a decent screenshot of it though, sorry.
I believe it was the warcraft 2 map editor. Had to make me a critter island. Then it was Heroes of might and magic 3. I love map editors. I made the biggest map in homm3. A large above ground and below ground 8 player map. Took like 9 months after school. Wish I still had the finished version :(