Vidpopup - Are you tired of the same old contact technique on your website?
Listmonk - Send e-mail campaigns from a powerful dashboard. High performance and features packed into one app.
VideoAsk - Typeform's VideoAsk is now available on your web browser
Sendy - Sendy is a self hosted newsletter app that sends emails 100x cheaper via Amazon SES
Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
Clean Email - Clean Email is an online service that empowers you to take control of your mailbox.