Mozilla Raindrop

Raindrop is a messaging application building on Apache's CouchDB which is used through a web interface. Raindrop works by collecting messages (currently emails and tweets, but more will be available through addons) and storing them as JSON optionally with attachments in CouchDB. They are then served to users with CouchDB's webserver so users can view them in their web browsers. By December 2009 there was a prototype for testers but no official stable release.