Balsa is described as 'e-mail client for GNOME, highly configurable and incorporating all the features you would expect in a robust mail client' and is an app in the Office & Productivity category. There are more than 10 alternatives to Balsa for a variety of platforms, including Windows, Linux, BSD, Mac and Windows S. The best alternative is Thunderbird, which is both free and Open Source. Other great apps like Balsa are Evolution (Free, Open Source), Mailbird (Paid), Claws Mail (Free, Open Source) and Microsoft Mail and Calendar (Free).
Mailbird helps individuals and businesses manage emails in one place. This allows you to simplify your workflows. Therefore, spend more time on important tasks. Moreover, 9 in 10 of our customers describe our interface as “intuitive” and beautiful.
Claws Mail is an email client (and news reader), based on GTK+, featuring Quick response Graceful, and sophisticated interface Easy configuration, intuitive operation Abundant features Extensibility Robustness and stability
KMail is the email component of Kontact, the integrated personal information manager of KDE. Kontact is a personal information manager and groupware software suite for KDE. It supports calendars, contacts, notes, to-do lists, news, and email.
Trojitá, is a fast Qt IMAP e-mail client that respects open standards and facilitates modern technologies. Trojitá values vendor-neutrality that IMAP provides and is committed to be as interoperable as possible.
EmailTray is a smart email client and an email notifier for POP3 and IMAP email accounts, including Gmail, Hotmail, Yahoo mail and AOL. EmailTray intelligently ranks messages, prioritizes them into 4 Inboxes and alerts you only to the most important.