I think it might be better if you add REST API and let the editor's developers create a plugin based on that. It's an interesting project. Appriciate :D
+1. I'm developing my live html/css/js code editor (http://liveditor.com) and I always interested in providing direct support for Twitter Bootstrap.
From what I've seen around: Dreamweaver, Visual Studio/Expression Studio and Eclipse.
who can help me build a live converter for the snippets? reach me at @msurguy on twitter.
Those are IDEs. The most popular text editors (at least on HN) are Sublime Text 2, Textmate, vim, and emacs.