Level editor
 

Downloaded the client and whatnot but can't find the level editor....help?

When you're on the login screen, find your start button in the lower left corner of the game. Click it and click install packages. From there you should be able to find anything you'll need for development.

Got it, thanks.

You might want to look into gonstruct though.
It's a bit better than Stefan's old level editor that hasn't been updated since 2005.

OMG it's Brad ^^

I agree, gonstruct is a modern and appropriate replacement.