Feather Attribution - A free and tiny javascript library to track UTM tags, ref and referrer data client side so you can store these in your own database.
Backer News - Fresh crowdfunding projects
LoyalAs - Get and track referrals automatically.
The 25 Days of Ideas - Free resources for coming up with startup ideas
ToneDen Lasso - Put fan and customer acquisition on autopilot
Republic - Where everyone can invest in startups & tokens