A few months ago I created a hosted document conversion service named Docverter. The idea was to collect together the best document conversion tools I could find into one comprehensive service and sell access. Many of these tools are difficult to install if you're used to a service like Heroku, so it only made sense to wrap it all up.
After two months of trying to make a go of it, I've made the decision to open source the server component of Docverter. I've put the source on Github, along with installation instructions. I'm also available on a consulting basis for installation and integration work. Email me if you're interested.