ToT: ThisOrThat - Let your friends choose this or that for you
GoodUI Evidence - People's A/B test results that show which UI ideas work best
sup - The first creep-free way to see nearby friends
Decidr - Make better decisions with quick A/B polls
Mu4e - Starting with version 0.9.8, mu provides an emacs-based e-mail client which uses mu as its back-end: mu4e.
PreFlight - Preflight is an Automated Web Testing tool. Allows everyone to automate Web UI tests.