GrowthList - A crowd-sourced list of growth hacks
GoodUI Evidence - People's A/B test results that show which UI ideas work best
GrowthHackers Projects - Growth collaboration software for teams 📈
Decidr - Make better decisions with quick A/B polls
Marketing Examples - A gallery of real world marketing case studies. Updated every day.
PreFlight - Preflight is an Automated Web Testing tool. Allows everyone to automate Web UI tests.