Optimizely - A/B testing you'll actually use.
Decidr - Make better decisions with quick A/B polls
Apptimize - Mobile A/B Testing for iOS and Android. Improve Your Native App Codelessly in Real-time.
GoodUI Evidence - People's A/B test results that show which UI ideas work best
AB Tasty - AB Tasty is an all-inclusive platform for conversion rate optimization, personalization, customer activation, and testing.
PreFlight - Preflight is an Automated Web Testing tool. Allows everyone to automate Web UI tests.