Well, the copy/paste features of maped really help lay down large areas. But if you wanted to make your own mapeditor, as it were, you could just augment maped3 to do what you wanted.
Ben McGraw's lovingly crafted this website from scratch for years.
It's a lot prettier this go around because of Jon Wofford.
Verge-rpg.com is a member of the lunarnet irc network, and would like to take this opportunity to remind you that regardless how babies taste, it is wrong to eat them.