Shim is a node.js app that enables simultaneous, synced web surfing across a variety of devices and browsers.

boomerang is a piece of javascript that you add to your web pages, where it measures the performance of your website from your end user's point of view. It has the ability to send this data back to your server for further analysis. With boomerang, you find out exactly how fast your users think your site is.

This piece of javascript measures a whole bunch of performance characteristics of your user's web browsing experience.