OptinMonster - OptinMonster helps to convert abandoning website visitors into subscribers and customers.
Brevo - Innovative online Email Marketing solution to manage your contacts, create & send your newsletters and track your results. More than 80 000 clients. Best prices and attractive features.
Poptin - Create engaging and high converting website pop ups and contact forms in minutes. With Poptin, you get access to a feature-packed conversion rate optimization toolkit that converts more website visitors into email subscribers, leads, and customers.
MailChimp - MailChimp is the best way to design, send, and share email newsletters.
GetSiteControl - Website popup builder & email marketing suite for ecommerce
MailPoet - MailPoet is an email newsletter plugin for Wordpress.