NoPassword is an open-source rails engine demonstrating passwordless logins using email as a secret delivery mechanism. It's hosted on Github. See the HN discussion.
Two-Factor at Twitter
I helped build two-factor at Twitter. Mat Honan of Wired wrote an article about it called "Twitter’s Killer New Two-Factor Solution Kicks SMS to the Curb".
I built a community site for fans of agave spirits called agavesociety.org.
Privacy Design Analyzer
For my masters program I built a tool for analyzing privacy concerns in a system using a method analogous to threat modelling. See an example of the tool running here. It's hosted on Github.