Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.

Hunter - Find all the email addresses related to a domain

LeadMaster - The LeadMaster LeadMasterCRM All-in-One solution includes: marketing automation, lead management, email marketing, website integration & much more.

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

Elucify - A completely free software tool that uses crowdsourced data to find business email addresses

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