Fit Analytics - Fit Analytics provides the size recommendation engine for ecommerce vertical.
RetailRocket - RetailRocket offers personalization and product recommendation engine for eCommerce.
Nosto - Personalized shopping experiences for e-commerce businesses
Dynamic Yield - Personalization & customer experience management
Scarab Research - Scarab Research provides highly personalized recommendations for customers of e-commerce businesses.
SearchSpring - SearchSpring is an eCommerce site search tool.