Publicly - Build in the open
AbTest.io - A free url shortener with A/B testing features
Go Fucking Do It - Set a deadline and a price. If you fail, you pay.
PreFlight - Preflight is an Automated Web Testing tool. Allows everyone to automate Web UI tests.
Task Fighter - The beat`em up calendar/todolist
Marpipe - Automate Your Ad Testing, Optimize Your Creative