Hacker News Front Page Explorer - A database of top ranking Hacker News front page posts
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.
Hacker News-cli - Browse Hacker News from your Terminal
LoyalAs - Get and track referrals automatically.
Hacker Newsletter - Best of Hacker News in your inbox every Friday.
ToneDen Lasso - Put fan and customer acquisition on autopilot