The best Calendar alternative to Betterbird is Thunderbird, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Betterbird and five of them are Calendar Apps so hopefully you can find a suitable replacement. Other interesting Calendar App alternatives to Betterbird are Evolution, Microsoft Outlook, Claws Mail and Foxmail.
Cross-platform email client supporting multiple identities, chat, and strong filtering. Extend functionality with add-ons like RSS/Atom feed readers and PGP support.
Evolution is a personal information management application that provides integrated mail, calendaring, address book and task list functionality.
Streamline emails, calendars, contacts, and task management with a smart inbox prioritizing critical messages. Includes calendar scheduling, third-party app integration like Facebook, Dropbox, and Trello, and support for Microsoft Exchange, Outlook.com, and Gmail, ensuring efficient task and email handling.
The advantages offered by Betterbird are absent in apps like Outlook, which doesn't even run on Linux, and isn't open-source.
Email and news client on GTK+ foundation featuring quick performance, extensible plugins, secure protocols, advanced filtering, strong folder and contact management, lightweight design, powerful search, customizable interface, multi-language support, and encryption.
Foxmail is a free POP3 and IMAP4 e-mail client in English and Chinese for Windows systems.
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Those looking for an alternative to BetterBird are most likely already looking for an alternative to Thunderbird