This is the third iteration of the BeLL software. It's a Backbone.js app that caches itself in the browser that is backed by CouchDB when a server is available and PouchDB in the browser when a server is not available. Initial support for PDFs is currently implemented, support for Videos and single HTML5 Apps coming next. Tracking bugs and new features in the Wiki at the moment.
https://github.com/ole-vi/BeLL-Apps/pull/91