Alternatives to Balsa for all platforms with any license

Thunderbird

Thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. The project strategy is modeled after Mozilla Firefox.

Free Open Source Mac Windows Linux BSD PortableApps.com ... Haiku
Extensible by Plugins/Extensions Extensible by Plugins/Extensions Built-in RSS reader Calendar integration ... Customizable Extensible by Plugins/Extensions Free API Import from Google Reader Integrated Chat Integrated Web Browser Multiple Account support Export to OPML Import feeds from OPML POP3 Support Portable Tabbed interface Add a feature

1749 Like
Evolution

Evolution is the official personal information manager and workgroup information management tool for GNOME. It combines e-mail, calendar, address book, and task list...

Free Open Source Linux BSD S/MIME GNOME OpenPGP
Built-in RSS reader CalDAV Calendar integration CardDAV ... Encrypted email Integrated Spam Protection Multiple languages POP3 Support Add a feature

150 Like
Mailbird

Mailbird is more than just another email client - It's an all-in-one communication platform for email, contacts, calendar, apps, task management, video meetings and...

Freemium $ $ $ Windows
Undo send Asana integration Sync Contacts Conversation view ... Dropbox integration Facebook integration GSuite Integration Multiple Account support Slack integration Trello integration Twitter integration Unified inbox Add a feature

269 Like
Claws Mail

Claws Mail is an email client (and news reader), based on GTK+, featuring Quick response Graceful, and sophisticated interface Easy configuration...

Free Open Source Windows Linux BSD
Lightweight Built-in RSS reader Content Filtering Customizable ... Extensible by Plugins/Extensions Support for IMAP Multiple languages Multiple Account support Add a feature

76 Like
Sylpheed

Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client (mailer, MUA). Sylpheed runs on many systems such as Windows, Linux, BSD, Mac OS X and...

Free Open Source Mac OS X Windows Linux BSD PortableApps.com
Lightweight Add a feature

51 Like
Kontact - KMail

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...

Free Open Source Mac OS X Windows Linux BSD
No features added Add a feature

31 Like
Trojitá

Trojitá, is a fast Qt IMAP e-mail client that respects open standards and facilitates modern technologies. Trojitá values vendor-neutrality that IMAP provides...

Free Open Source Windows Linux
IMAP debugging Support for IMAP Add a feature

12 Like
Microsoft Mail and Calendar

Windows 10 has Mail and Calendar apps already built in. With the Mail application you can now easily see all message from your...

Free Windows Windows S
Email tracking Bundled with Windows Add a feature

17 Like
Nextcloud Mail

💌 Mail app for Nextcloud.

Free Open Source Self-Hosted
No features added Add a feature

3 Like
Columba

Columba is an email client written in Java, featuring a user-friendly graphical interface with wizards and internalionalization support. Its a powerful mail management...

Free Open Source Mac OS X Windows Linux BSD
No features added Add a feature

3 Like
- Discontinued The project is no longer developed. Last version, 1.4, released in March 2007, can be still downloaded from SourceForge.
EmailTray

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...

Free Windows Android
Support for IMAP POP3 Support Add a feature

3 Like
InboxZero

Email conversations InboxZero automatically gathers your emails in conversations by contact. You can quickly browse all your emails exchanged with a contact in one...

Free Mac OS X Windows Android iPhone iPad ... Apple Watch
Multiple Account support POP3 Support Portable Add a feature

1 Like
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TouchMail

Navigate messages with zooms and swipes across your messages. Turn your email into colorful, visual tiles you can explore with your fingers or mouse. Rich 3D...

Free Windows Windows RT
Support for IMAP Add a feature

0 Like