This document lists and describes 15 of the top website optimization services. It discusses how these services can help optimize websites through A/B testing, heat mapping, session recording, speed testing, and other methods to improve the user experience and increase conversions. Some of the top services mentioned include Optimizely, VWO, Kissmetrics, OptinMonster, YoastSEO, Smartlook, and Google Analytics. The document recommends testing multiple services to determine the best fit for each individual business.