Same here. I'm really excited about what these people (and others) are doing in this space, but the lack of an open source code and the service lock-in (mostly)

Same here. I'm really excited about what these people (and others) are doing in this space, but the lack of an open source code and the service lock-in (mostly) are huge turn offs for me. I've started building a prototype of this idea using PouchDB/CouchDB (data is stored locally in PouchDB, synced to your own CouchDB server or Cloudant). As with most of my side projects, it remains abandoned waiting for some love.