AbTest.io - A free url shortener with A/B testing features
Hotjar - The #1 Leader in Heatmaps, Recordings, Surveys & More. Sign up for a 15-day free trial and start learning from real user behavior today!
GoodUI Evidence - People's A/B test results that show which UI ideas work best
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.
PreFlight - Preflight is an Automated Web Testing tool. Allows everyone to automate Web UI tests.
Lucky Orange - Get into the minds of your customers by watching them navigate your site and chatting with them as they do so.