Hunter - Find all the email addresses related to a domain

Simply Measured - Simply Measured helps data hungry marketing & PR folks measure social media and create beautiful, custom reports in Excel and other formats.

Apollo.io - Apollo’s predictive prospecting, sales engagement, and actionable analytics help the teams to reach its full revenue potential.

Vaizle - Vaizle is a marketing analytics suite that brings all your ads & social media data into one actionable dashboard. Try Vaizle's free tools for social media, ads, and competitive analysis, alongside Google Sheets and MS Excel connectors.

Icypeas - This email finder has the capacity to bypass catch-alls

Frrole Scout - A complete social intelligence tool that incorporates Social Listening, Audience & Influencer Intelligence in a simple, elegant UI.