MailChimp - MailChimp is the best way to design, send, and share email newsletters.
Zelos - A very simple app for mobile teams - tasks and chats on desktop and mobile.
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.
Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
SendPulse - Maximizing e-mail marketing open rates automatically
GroupServer - Email lists, with an integrated web interface, and control.