Betterbird is billed as a fine-tuned version of Mozilla Thunderbird. It’s a soft fork of Mozilla Thunderbird. Soft fork means that it is closely following the Thunderbird Extended Support Releases (ESR).
Betterbird claims it improves on Thunderbird in a few days including additional features and bug fixes.
This is free and open source software.
Features include:
- System tray icon.
- Accent colors.
- Multi-line inbox view.
- Internationalization support.
- Cross-platform support – runs under Linux, macOS, and Windows.
Website: www.betterbird.eu
Support:
Developer: Betterbird
License: Mozilla Public License 2.0

Betterbird is written in C. Learn C with our recommended free books and free tutorials.
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Please read our Comment Policy before commenting.
I don’t see a compelling reason to use this over Thunderbird. Or am I missing something?
I agree, no good reason to use this fork.
The developer of Betterbird claims his fork adds some useful features. But don’t forget the maintainer is extremely bitter towards Mozilla; this is a hostile fork. He was banned from the Thunderbird Council, and banned for life from the Mozilla Community.