Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
hubsell - Sales automation for modern sales teams
BuiltWith - Find out the technology behind websites
Elucify - A completely free software tool that uses crowdsourced data to find business email addresses
WhatRuns - Extension that helps you identify technologies used on any website at the click of a button.
VisitorTrack - Cloud Based Affordable Biometric Visitor Management System To Eliminate Maintenance & Expense of ID Cards & Printers, Replace Paper Logs & Sign-In Sheets.