Open source Email clients


Balsa is a lightweight e-mail client for GNOME. (GPL)

Linux - FreeBSD

Claws Mail

Claws Mail is an email client (and news reader), based on GTK+. (GPL)

Linux - FreeBSD


Evolution provides integrated mail, addressbook and calendaring functionality to users of the GNOME desktop. (GPL)

Linux - FreeBSD


Geary is a new email reader for GNOME designed to let you read your email quickly and effortlessly. Its interface is based on conversations, so you can easily read an entire discussion without having to click from message to message. (LGPL)



Kontact is a personal information manager and groupware software suite for KDE. (GPL)

Linux - FreeBSD


Boost your productivity and send better email with Mailspring, the best mail client for Mac, Linux, and Windows! Mailspring is a new version of Nylas Mail maintained by one of the original authors. (GPL)

Linux - Windows - MAC OS X


N1 is an open-source mail client built on the modern web with Electron, React, and Flux. It is designed to be extensible, so it's easy to create new experiences and workflows around email. (GPL)



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

Linux - FreeBSD - Windows - MAC OS X


Mozilla Thunderbird is a free, open source, cross-platform e-mail and news client developed by the Mozilla Foundation. (MPL)

Linux - FreeBSD - Windows - MAC OS X

9 applications