Trip Planner is a lightweight interface on top of Google Maps which makes planning multi-stop trips easier. The code is open-sourced on GitHub.
Whoopsie is a visual regression tool for testing responsive web sites. Mostly compatible with the BBC’s Wraith regression tool, with an aim to be faster and simpler.
A Hacker’s Guide to Git
A brief look at how Git works under the hood. Available to read for free on wildlyinaccurate.com, and Leanpub.