- [Claws Mail](http://www.claws-mail.org/) - Old school email client (and news reader), based on GTK+.
- [Claws Mail](http://www.claws-mail.org/) - Old school email client (and news reader), based on GTK+. ([Source Code](https://git.claws-mail.org/?p=claws.git;a=tree))
- [ImapSync](http://imapsync.lamiral.info/) – Simple IMAP migration tool for copying mailboxes to other servers.
- [ImapSync](http://imapsync.lamiral.info/) – Simple IMAP migration tool for copying mailboxes to other servers.
- [Mutt](http://www.mutt.org/) - Small but very powerful text-based mail client.
- [Mutt](http://www.mutt.org/) - Small but very powerful text-based mail client.
- [Nylas Mail](https://www.nylas.com/nylas-mail/) - Extensible mail client.
- [Nylas Mail](https://www.nylas.com/nylas-mail/) - Extensible mail client.