Xpenser »
A while ago I had an idea for an expense tracking system tailored for students, small businesses, and the like. I pictured a bare-bones web tool, with a strong API that would allow other sites and plugins to add features as they were requested. The core feature behind the site would be the way expenses were added - through a web interface, SMS messages, voice recordings, or even cameraphone pictures.
Xpenser is the closest thing I’ve seen to my original idea. The site is missing that API system I was dreaming about, and I’m not sure the idea of having to text each receipt is something I could consistently do (as opposed to just taking a snap of it), but the site is very new and has room for development.