Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
Vidpopup - Are you tired of the same old contact technique on your website?
Groups.io - Email and web based discussion group software, includes archiving, emails, wiki, polls, file...
VideoAsk - Typeform's VideoAsk is now available on your web browser
Gaggle Mail - Gaggle Mail is a simple and easy to use email list manager.
Mailman - Mailman is free software for managing electronic mail discussion and e-newsletter lists.