I've been working for about the past 2 weeks on the map editor for the Harvest Engine and I've finally got something working. I'm gonna need a few tests though to pick up on bugs that I missed and to get some feedback on the UI. The editor is written in VB 2008 as opposed to the Core Engine, which is in C++. So, you'll need the VB runtime if you don't already have it. Play around with it, see what you like and don't like. Oh, let me also mention that you can't save or open map files just yet. You also can't place any entities, as I don't have any from the engine ready to be used yet.
Known issues:
crashes if you try to remove a tile or a hitbox on an empty layer
By default, you should have the same tileset selected that I have in my screenshot. Not
really an issue, but when you change a tileSet, the default will dissapear.
http://forum.gd-u.com/fileslol/Harvest%20Earth.rar - map editor
http://www.softwarepatch.com/windows/vbrun6.html - VB runtime
screenshot (a bit outdated):