Sepy Actionscript editor
http://www.sephiroth.it/python/sepy.php
So far this is the only competition to the brilliant SciTE|Flash Actionscript editor. At first sight Sepy has lots of features that you might not think you would use, and the menu looks a little cluttered. But if you start using it and its tools to the fullest then you can make sense of it pretty quickly.
Highlights are the xml document viewer that gives you the path to a node when you click on it in the explorer window, and you can browse whole directories/packages of classes with an Explorer type view too.
When you have a class open in the main editing window, you can see all the methods in the class in the explorer window on the left and jump straight to them just by clicking on their name. This could end up being a Godsend for long classes. As you would expect there is also the ability to fold code into more manageable blocks by clicking on a expand/collapse icon at the start of each major code block.
I will still be setting mine up with nice fonts and the colour schemes that I am most used to for the next couple of days, and I will have to get used to switching programmes to edit .as files, but anything is an improvement on Flash’s find/replace function in the native Actionscript editor.
[edit] I might have a buggy release but it was acting oddly the other day. It was still tracing commented out trace statements. This makes me think that it was looking at an older version of the .as file or not saving correctly. I will keep an eye out for this.