Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
LinkedIn Sales Navigator - Sales tool for LinkedIn users.
BuiltWith - Find out the technology behind websites
SalesforceIQ Inbox - Connect Salesforce CRM with email inboxes
WhatRuns - Extension that helps you identify technologies used on any website at the click of a button.
Clearbit - Clearbit provides Business Intelligence APIs