AbTest.io - A free url shortener with A/B testing features
Optimizely A/B Testing - Optimizely A/B Testing is an experimenting platform that uses two or more versions of demographics to the users.
GoodUI Evidence - People's A/B test results that show which UI ideas work best
StoreMaven - A/B testing and design platform for App Store and Google Play icons, screenshots and videos.
PreFlight - Preflight is an Automated Web Testing tool. Allows everyone to automate Web UI tests.
Apptimize - Mobile A/B Testing for iOS and Android. Improve Your Native App Codelessly in Real-time.