Circles-level-editor is a project mainly written in ..., it's free.
Simple Flash / XML tiles based level editor
This is a super simple level editor that I made in AS3 / Flash for an iOS MMORPG that I have been creating.
Since creating this, I ported the level editor to Obj-C - therefore this project is dead, but use it as you please!
The tileset should not be used for any commercial projects without express written permission from me.