PouchDB is a new project from former CouchOne (now called Couchbase) employee Mikeal Rogers. It’s an attempt to create a full JavaScript implementation of the CouchDB storage and views API to enable peer-to-peer replication with “real” CouchDB instances.
The current version supports the HTML5 data store IndexedDB, and Rogers plans to support LevelDB in the future.
Read more at ReadWriteWeb Hack