Protection
Protection against mass surveillance and spying. ShutUpTrackers is a socially motivated website that provides information for protecting your data security and privacy
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NEXTCLOUD
Nextcloud is a suite of client-server software for creating and using file hosting services. This includes calendar sync via CalDAV and contacts sync via CardDAV. Nextcloud is free and open-source, thereby allowing anyone to install and operate it without charge on a private server.
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ETESYNC
Secure, end-to-end encrypted, and privacy respecting sync for your contacts, calendars and tasks. EteSync provides you with strong assurances of privacy and safety for your personal information, more control of your data, and a full history of all the changes made to it.
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ProtonCalendar
ProtonCalendar is the first fully encrypted calendar app. You can use it to keep track of your plans and appointments while keeping your data private. ProtonCalendar is only available for members who paid protonmail.