100 in 100 Challenge - Get 100 new paid users in 100 days
Decidr - Make better decisions with quick A/B polls
GrowthHackList - 100+ curated growth hacks for makers + early stage startups
Go Fucking Do It - Set a deadline and a price. If you fail, you pay.
Marketing Examples - A gallery of real world marketing case studies. Updated every day.
AbTest.io - A free url shortener with A/B testing features