Sonic Advance Editor (SAE if you like it better) is a general purpose editor for the Advance series written by JoseTB. Current release features a level editor for layers BG1 and BG2 and support for Sonic Advance 1 (eur, usa and jap). This version is still quite preliminary and lacks several features he intended to add (hence why I'm labeling it as 0.1), such as palette/tile editors or SAdv2/3 support, but since he'll be off next week I'd rather release it and give updates with the time.
You'll need the lastest package of the .NET Framework for it to work, and possibly a screen resolution of 1024x768 or higher. Also please note it's also labeled 0.1 since it might not be fully stable yet - shouldn't be anything worrying but feel free to report problems.
Download: http://www.fileden.com/files/2007/7/19/1280033/SAEditor.rar (Mirrors are quite certainly welcomed...)
Feedback it's appreciated, though I'm guessing it won't be that much. Nevertheless he enjoyed the development of this tool and he hopes to be able to bring further updates in the near future. Enjoy, to those who might even try it and everything.
Original Thread is here:
http://forums.sonicretro.org/index.php?showtopic=10365