Listeron - An email address for your group. Discuss. Debate. Organise. All with email.

Hiver - Manage Customer Support, Sales and Projects right from your Gmail inbox. Collaborate with Shared Labels, Shared Contacts, email notes, email reminders and email templates

WP Mailster - WP Mailster enables you to run a listserv-like email discussion list on your WordPress site.

Clean Email - Clean Email is an online service that empowers you to take control of your mailbox.

Gutama - Gutuma was born out of the need for free mailing list / newsletter software that is geared, not...

Nylas Mail - The Nylas Cloud API powers your application with email, calendar & contacts features. Built-in features for better email, calendar, and contact management.