Depict.ai - Amazon-quality product recommendations for any online store
Q-Stats - Get free marketing insights for every question on Quora.
Suto - Get one-on-one expert product recommendations.
Site Rank Data - View historical rank information of websites via time series charts.
MailChimp Product Recommendations - Easily build automated personalized email marketing
HypeStat - HypeStat is free statistics and analytics service, where you can find information about every website.