Optimizely - A/B testing you'll actually use.
Taplytics - Mobile A/B testing for everyone. With the world's most fully featured mobile A/B testing platform.
Evolv - Evolv is the visual editor for web-based projects that are used to find better ways to connect with customers in order to improve marketing economics.
Splitforce - Splitforce A/B testing for iOS, Android, and Unity mobile applications.
SplitMetrics - SplitMetrics is the A/B testing platform for App Store and Google Play page to discover the most converting icons, screenshots, video, etc.
Apptimize - Mobile A/B Testing for iOS and Android. Improve Your Native App Codelessly in Real-time.