1. OnionMail the TOR encrypted Mail Server

  2. Secure premium email service with mobile sync apps for calendar, contacts, tasks, notes and FISMA compliant email archiving.

  3. Show you are in business and look professional with custom email at your company domain.

  4. Email service, combined with the Ethereum blockchain.

  5. LuxSci providing HIPAA-compliant email, secure email & web services.

  6. MrMail offers flexible Zimbra Hosting packages suitable for everyone, from single home user to a...

  7. Open Source WebMail Lite is a free community edition of full-featured WebMail Pro server applicatio...

  8. Your right to privacy. Simplify your life with eclipso, the safe & central place to organize and share your emails, photos, files, contacts, calendar events and more.

    freemium €1.0 / Monthly (eclipso Connect, 20 GB, IMAP, Ad free)

  9. K-9 is an opensource email client making it easy to chew through large volumes of email.

  10. SOGo is groupware server with a focus on scalability and open standards.

  11. RainLoop is a web based email client.

  12. OpenProject is an open-source project management software with a wide set of features and plugins.