Go Fucking Do It - Set a deadline and a price. If you fail, you pay.
Cypress.io - Slow, difficult and unreliable testing for anything that runs in a browser. Install Cypress in seconds and take the pain out of front-end testing.
Decidr - Make better decisions with quick A/B polls
Galen Framework - Automated testing of look and feel for your responsive app
AbTest.io - A free url shortener with A/B testing features
Bitrise - Tens of thousands of agencies, startups and enterprise companies with mobile apps - including Runkeeper, Grindr, Duolingo and more - use Bitrise to automate their way to increased productivity & speed