A website where anyone could apply for a Google+ invite. Invites were pretty "rare" when G+ first came out, hence the service. Over 15k invites sent out in 2 weeks.
A small, free, open source tool for creating websites. It's built with PHP, jQuery, Bootstrap. Started in 2008, meant to be a really small and simple solution for running a website. It doesn't require any setup - unzipping and uploading to hosting/server/cloud is the only step required.
Created Wizards League at the age of 11, later became the biggest pool gaming league with over 10k members.