I'll continue to maintain IAT! as long as it can work in Firefox.
Firefox is changing its security model for extensions to make it more like Chrome's. Eventually, it will be impossible for IAT! to work as a pure extension anymore.
Over the years, I've been working on IATED (https://github.com/docwhat/iated) which was meant to be a replacement for IAT! -- a sort of IAT! next generation.
IATED would be two parts: a server to open the editor and an extension that talks to it.
But I've become distracted and disheartened by figuring out how to make it as simple to install and use as IAT! yet remain secure.
Some issues:
* I know enough security practices to know I'm not even close to being an expert. IATED has the potential to do really bad things if insecure. Letting a malicious page read random files on your file system (or worse, write them!) is the obvous vector.
* I would want to support the same platforms: Linux, OS X, and Windows. But each platform has very different requirements. Windows users are going to be confused if IATED is purely command line driven, for example.
* What language should I write it in. I have several false starts, with the current 'master' branch being JRuby. But depending on the JVM seems horrible. 'golang' is pretty new and maybe the way to go. I'm not sure.
* I work on IAT! mostly alone, though xOneca has been a great help. Writing IATED by myself is discouraging. I'd love to have someone who knows about golang or Windows or security help me write IATED.
Anyway, that's roughly the state of IAT! and IATED at the moment.
I have some bugs open on the project and maybe someday I can switch from Vim to Atom comfortably.
I also hear that the It's All Text! author is lazy... every time I go home to the family. ;-)