MailMunch

MailMunch offers a WordPress plugin for building popups, slide-in boxes, and scroll-triggered forms to capture email signups. You can A/B test different form designs to see which performs best, and the plugin works with all the major email marketing services. You also get exit-intent technology that shows a form right when visitors are about to leave.

MailMunch appeals to anyone who wants simple form building without heavy automation features. It's straightforward for bloggers and content sites that need to grow their list quickly, though it doesn't include the CRM or workflow tools that more advanced platforms offer.