It's forged from (among other things) Django, Jinja2, elasticsearch, jQuery and a dash of love.
We have some good install docs if you want to try it out. We'd love your help! You can come talk to us on irc://irc.mozilla.org/amo if you have questions.
If you like what we've done, you may want to check out Mozilla's Playdoh. We took all the cool stuff we did in AMO, SUMO and our other websites, and created a base template for new websites.