AeroLeads - AeroLeads is a lead generation software which finds prospects with email and phone number.

BuiltWith - Find out the technology behind websites

GrowBots - Grow your SaaS faster with automated customer acquisition

Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.

Prospect.io - Prospecting, like a boss. Find any email, reach out, measure everything and integrate with your CRM.

WhatRuns - Extension that helps you identify technologies used on any website at the click of a button.