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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
Polymail - Native email app for email productivity.
Superhuman - Superhuman is an email management tool.
Airmail for iOS - One of the best Mac email clients, now on iPhone
Mailman - Mailman is free software for managing electronic mail discussion and e-newsletter lists.
New Gmail - The new version of Gmail web