Skuuudle - Discover, match and monitor your eCommerce competitors.
Minter.io - Instagram Analytics. Twtitter Analytics. Facebook Analytics
Price2Spy - Price2Spy is a price monitoring, pricing analytics, and repricing tool, meant to help eCommerce professionals keep an eye on their competitors or retailers.
Instagram Analytics by Socialinsider - Get better at Instagram marketing by studying competition
BuiltWith - Find out the technology behind websites
HypeAuditor - All-in-one Influencer Marketing Platform