FilmHope - A/B test YouTube titles & thumbnails
GoReplay - GoReplay is an open-source tool for capturing and replaying live HTTP traffic into a test environment.
AbTest.io - A free url shortener with A/B testing features
Testlio - Testlio is a community of expert testers that help companies release their apps with highest confidence
PreFlight - Code-free automated UI testing - Free forever
LambdaTest - Perform Web Testing on 2000+ Browsers & OS