http://nodejs.org/

http://nodejs.org/docs/latest/api/cluster.html

NeDB: a lightweight Javascript database using MongoDB’s API - NeDB is a lightweight database written entirely in Javascript, and that implements the well-known and loved MongoDB API. It is packaged as a Node module that be used with a simple require and can be used as an in-memory only or persistent datastore. You can think of it as SQLite for MongoDB projects.

node-webkit is an app runtime based on Chromium and node.js. You can write native apps in HTML and Javascript with node-webkit. It also lets you to call Node.js modules directly from DOM and enables a new way of writing native applications with all Web technologies. Linux: 32bit / 64bit, Windows: win32, Mac: 32bit, 10.7+

Why the Hell Would You Use Node.js