Evercookie - uses devious ways to try to track users. Hmm, this one is questionable. Please use it for good, not evil… :/
yepnope.js - a wrapper around LABjs Script Loader to save bandwidth by only loading needed components. Think of JSON - there’s no reason to send this down the wire if the browser supports this natively.
Chrome Speak To Site; Give any input the power to listen to you - support for input type=speech (supported by WebKit)
embedJS - selective JS for embedded devices (mobile, TV, etc.) based on capabilities.
JS Console for iOS - native JS console built by Remy Sharp.
Joyent Node SmartMachine - API for node.js?