Sure. It's powered by a custom framework running on NodeJS. Links screenshots are taken by PhantomJS and images are compressed/optimised by ImageMagick, Jpegtran, Pngcrush, and Optipng. If you have additional questions I'd be more than happy to answer them.
edit: Ahh good point, I'll be sure to remove the dot.
edit: Also one very very minor pet peeve of mine is when you have an activation code in email with punctuation around it, e.g.
> Your activation code is 123456.
Chrome actually does a good job of disregarding the period when I double click to highlight. Sorry for the bikeshedding!