Wappalyzer - Wappalyzer is a technology profilers and leads data provider. Create lists of websites and contacts that use certain technologies.
Hunter - Find all the email addresses related to a domain
PicMonkey - PicMonkey is a feature-rich online photo editor that works right in your browser; no downloads...
Snov.io - More leads. More sales. More revenue.
PublicWWW - source code search engine
Apollo.io - Apollo’s predictive prospecting, sales engagement, and actionable analytics help the teams to reach its full revenue potential.