Skuuudle - Discover, match and monitor your eCommerce competitors.
Clearbit - Clearbit provides Business Intelligence APIs
Price2Spy - Price2Spy is a price monitoring, pricing analytics, and repricing tool, meant to help eCommerce professionals keep an eye on their competitors or retailers.
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
BuiltWith - Find out the technology behind websites
LinkedIn Sales Navigator - Sales tool for LinkedIn users.