1. Add forums and commenting to your site. Unlimited posts, users and traffic, for free. Embeddable, styleable and scriptable.

  2. TrulyMail is a multiple email management program for those users who have to frequently sign in to multiple email accounts.

  3. Organize your world. Outlookโ€™s email and calendar tools help you communicate, stay on top of what matters, and get things done.

  4. Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client (mailer, MUA).

  5. Mailbird is the best email client for Windows 7, 8 and 10

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

  7. Geary is an email application built for GNOME 3.

  8. The first creep-free way to see nearby friends

  9. Airmail is a lightweight and lightning fast mail client for Mac.

  10. Kontact is the integrated Personal Information Manager of KDE.

  11. Mail and Calendar apps already built in Windows 10.

  12. Email client by KDE, supporting POP3 and IMAP mailboxes.