OptinMonster - OptinMonster helps to convert abandoning website visitors into subscribers and customers.

Hunter - Find all the email addresses related to a domain

Yeps! - All-in-one bar for your website

Snov.io - More leads. More sales. More revenue.

Freebiebucket - Curated free tools & resources for makers 🛠

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