Storage libraries

These libraries allow you to persist data across browser sessions. Usually they use HTML5 Local Storage and some other tech as fallback.

• AmplifyJS - supports IE 5+, Firefox 2+, Safari 4+, Chrome, Opera 10.5+, iPhone 2+, Android 2+ and provides a consistent API to handle storage cross-browser.
• Data.js - Data Manipulation and Graph Persistence for Node.js and the Browser.
• Kizzy
• PersistJS
• jStorage
• Lawnchair - Sorta like a couch except smaller and outside, also, a client side JSON document store. Perfect for webkit mobile apps that need a lightweight, simple and elegant persistence solution.
• Artemia - Artemia is a clientside JSON document store like Lawnchair (in the way of CouchDb). It's very very (and very) inspired by Lawnchair (he copy many aspects, normal, i love Lawnchair) but has some specific features (like modules).
• TaffyDB
• meelo-store
• Gazel
• PouchDB - Portable implementation of CouchDB
• BankersBox - A redis-like wrapper for javascript data storage using localStorage as the default persistent data-store.
• lostorage.js
• sql.js - SQLite realisation on JS

In addition you might want to check out filer. It wraps HTML5 Filesystem API. See also this article.