I taught for half a year at Metis, an intensive Ruby on Rails bootcamp that covered every part of a Rails app from DNS records to ActiveRecord.
Croniker is a Haskell web application that lets users schedule changes to their Twitter name and profile picture (like Buffer). I conceived and built the application by myself. This project led directly to a blog post on Twitter's complex Unicode rules.
I volunteered at RailsBridge Boston for 2 years. As part of the leadership team in Boston, I coordinated events and formalized all of the event documentation for new members. I now volunteer at Railsbridge in San Francisco.
A Vim plugin to run tests using any external dispatcher. This is one of the few Vim plugins written using TDD, as detailed in "Write a Vim Plugin with TDD".