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VWO - Use VWO to tweak, optimize & personalize your website with minimal IT help.
Boozang - Empower your whole team to build and maintain automated tests, not just developers. A new approach to UI and API testing. Boozang is written in Javascript and does not rely on Selenium web driver.
Optimizely - A/B testing you'll actually use.
locust - An open source load testing tool written in Python.
Crazy Egg - Through Crazy Egg's heat map and scroll map reports you can get an understanding of how your visitors engage with your website so you can boost your conversion rates.
Loader.io - Loader.io is a simple cloud-based load testing service