I’m exploring using Komodo Edit for Arduino development, right now by integrating building and other operations within the editor using a Makefile. If this works well enough, I may pursue other kinds of support as well. Details of what I’ve done so far are available on my blog. Comments and participants are invited (either here or on the blog).
Very interesting project, I wish you the best of luck ! 
Just one thing that stood out from your blog that you can easily change/improve; You can import and export tools straight from the toolbox, you do not need to navigate to the filesystem location. Just export the tools and import them either via the context menu or by dragging the komodo tools onto the toolbox.
Thanks for pointing that out. I’ll update my blog entry to reflect that.