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.

Gone - An ephemeral to-do list

LoyalAs - Get and track referrals automatically.

Streaks - The to-do list that helps you form good habits.

ToneDen Lasso - Put fan and customer acquisition on autopilot

Todoist - Todoist is a to-do list that helps you get organized, at work and in life.