InstapaperBeyond-For-Chrome is a project mainly written in JavaScript, it's free.
Port of the InstapaperBeyond extension for Safari
This is a port of the Instapaper Beyond for Safari extension (http://brettterpstra.com/instapaperbeyond/) by Brett Terpstra (http://brettterpstra.com/). I just wanted a chrome extension.
Not that the crx file here DOES NOT auto update. Fix coming in the future.
On the Chrome Web Store: https://chrome.google.com/webstore/detail/fojfjbjlfgdhckgnhhieilpaddminnni