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Horde - Horde Groupware is a free, enterprise ready, browser based collaboration suite.
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
Roundcube - Web-based IMAP email client
Clean Email - Clean Email is an online service that empowers you to take control of your mailbox.
Mailo - Mailo is an email client where you can send and receive emails to and from anyone with an email address.
Nylas Mail - The Nylas Cloud API powers your application with email, calendar & contacts features. Built-in features for better email, calendar, and contact management.