"PouchDB is an open-source JavaScript Database inspired by Apache CouchDB that is designed to run well within the browser.

PouchDB was created to help web developers build applications that work equally as well offline as they do online. It enables applications to store data locally while offline, and synchronize it with CouchDB and compatible servers when the application is back online, keeping the user's data in sync no matter where they next login."

"Offline.js is a library to automatically alert your users when they've lost internet connectivity, like Gmail.

It captures AJAX requests which were made while the connection was down, and remakes them when it's back up, so your app reacts perfectly.

It has a number of beautiful themes and requires no configuration."