Klaviyo - Klaviyo helps brands own the customer experience, grow higher-value relationships, and deliver more personalized marketing experiences across email, mobile, and web.

HoverSignal - Increase your website's conversions with notifications

Criteo - Build, scale, and activate first-party audiences with The Commerce Media Platform.

AnyMailFinder.com - Find anyone's email address

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