I'm looking for one. I tried Reptile (http://opensword.org/reptile/) but its rather incomplete and the file format is overly complex for what I'm doing.

I may end up just having to write my own, but every time I think about doing so, I'm overwhelmed by the "you're reinventing the wheel" feeling. Are there any available that you use? I don't require any more frills besides "level is x by y, sprite z goes here" for now.

Wow that would be a cool app, if the output could be used easily.
The export gives me a tiff, the save gives me a binary file, where's the simple text output: sprite # @ x,y?

At a glance it seems exactly the kind of editor I'd like to make/use.
Except for the lack of export options.
I'll have to look more into after UDG, thanks for posting it.
I tried to script something similar but its nowhere near Reptile.

If you think you can roll your own, do you think it would be easier
to add a text export option to Reptile?

Or maybe some app that extracts that info from .rtm?
Maybe just bug the developers?

Ah, I didn't even notice Reptile included the source with the MIT license. I might work on adding more export options to Reptile, especially considering a .tiff isn't all that useful.

I'll keep you posted, though if anyone knows of any other apps, be sure to holler.