The best open source alternative to Nextcloud Calendar is Tuta Mail. If that doesn't suit you, our users have ranked more than 25 alternatives to Nextcloud Calendar and 13 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Nextcloud Calendar are Fossify Calendar, Tuta Calendar, Etar and Right Calendar.
Offers comprehensive encryption for email, calendar, and contacts with zero personal info required. Built on open source, install via Play Store, F-Droid, or APK, with Tor and VPN support. Both free and paid plans; utilizes quantum-resistant encryption ensuring privacy-focused, anonymous usage.
Your privacy-aware, open-source calendar with intuitive design and multi-platform syncing.
Tuta Calendar offers secure event organization with end-to-end encryption and no ads or tracking. Enjoy multi-device sync, multiple calendar views, and offline access. Fully compliant with strict German data protection laws. Manage recurring events, unlimited calendars, and seamlessly integrate with Tuta Mail.
Right Calendar app is a versatile scheduling tool that offers unparalleled flexibility to its users. One of its standout features is that it is built on an open-source platform. This not only ensures transparency but also allows for constant updates and bug fixes from a...
Calendar encryption: View calendars and stores them encrypted on your device or in the cloud.
fruux is a free service that takes care of your contacts, calendars and more so you don't have to. Never manually copy contacts and calenders between your devices again!
Merkuro is a calendar and contact application that allows you to manage your tasks, events and contacts. Merkuro supports both local calendars as well as a multitude of online calendars: Nextcloud, Google® Calendar, Outlook®, Caldav, and many more.
A privacy-first calendar that works offline and looks beautiful. Connect to iCloud — or don't. Your schedule, your choice.
CalDAV and CardDAV server for calendar and contact data based on PHP, SQLite/MySQL, and SabreDAV
lightweight, client-only calendar web application. All data persists in the URL hash for instant sharing, No backend required. Optional AES-GCM password protection keeps shared links locked without a server.
muCalendar is a lightweight, open-source desktop calendar application built for users who value privacy and simplicity. It brings your remote calendars — whether self-hosted or cloud-based — into a clean, native desktop experience.
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