OptiMonk - OptiMonk is the most powerful Onsite Retargeting platform, that helps you increase the conversion rate of your site, and get more leads by recovering lost visitors.
MailerLite - Affordable Email Marketing Software. Get all features (Segmentation, Automation, A/B testing) for up to 1,000 subscribers & send unlimited emails for free!
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.
Publicate - Build Beautiful Emails. Export and Send Anywhere.
OptinMonster - OptinMonster helps to convert abandoning website visitors into subscribers and customers.
Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES