100 in 100 Challenge - Get 100 new paid users in 100 days
GrowthList - A crowd-sourced list of growth hacks
GrowthHackers Projects - Growth collaboration software for teams 📈
#buildinpublic - Discover what people are building in public
Marketing Examples - A gallery of real world marketing case studies. Updated every day.
FIRST - Post a date, pick a winner & meet up.