Spent some time a couple months ago hacking on a D plugin for IntelliJ. Haven't gotten very far, but did result in a working lexer. My day job got significantly crazier, so haven't had a chance to work on it lately.
Wanted to have quite a bit more done before releasing into the wild, but thought I'd throw something out there before I head out the door to Dconf.
On github:
https://github.com/elendel-/intelliD
It started out as a rewrite of the mono-d lexer, though ended up reorganizing/rewriting things a bit as I went along. Whole thing is 'licensed' in the public domain, so hopefully someone will find it useful.
(Resending this from a different email address, as first one didn't appear to go through. Apologies if it shows up twice. Also, my hotel has free internet, yay)