Go Fucking Do It - Set a deadline and a price. If you fail, you pay.
Streaks - The to-do list that helps you form good habits.
Decidr - Make better decisions with quick A/B polls
Letz - Chat bot that will make you enjoy productivity
AbTest.io - A free url shortener with A/B testing features
Minimalist - Password manager for iPhone, iPad, Mac, with iCloud Sync