hubsell - Sales automation for modern sales teams
Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Elucify - A completely free software tool that uses crowdsourced data to find business email addresses
BuiltWith - Find out the technology behind websites
Nexsales - B2B Demand Generation
Albacross - The world's first free B2B Lead Generation Network. Albacross help companies master their B2B digital marketing with Lead Generation and targeted marketing