I stumbled across this at ENWorld the other day and have been playing with it for the last day or two.
Screenshot from Masterplan’s homepage.
It has a handy export to HTML function, but I really didn’t like the way it showed up. I exported a little test thing (because I was bored), and since then I’ve done a significant bunch of HTML and CSS recoding to my own personal tastes. I present the half-assed combat encounter “Calopus Attack.”
(Incidentally, I’ve also been experimenting with GTDTiddlyWiki and repasting info from my Red Hand of Doom campaign, but just characters so far. Wiki coding is less intuitive and therfore more time-consuming. Link)
EDIT - figures that dropbox breaks as soon as I post this.
EDIT2 - and it appears to be back.