Apps similar to Tuta Calendar include Google Calendar, which is free for personal use. Other options are Proton Calendar, Posteo, Etar and KashCal. Calendar Apps like Tuta Calendar are a crowded field, with more than 25 alternatives for the web, Android, iPhone, Mac and iPad.
Access your calendar via access links without a login. For your calendar you get several access links for which you can set individual permissions (e.g. read or write).
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Your calendar, on steroids. Enhance your productivity and organise your time with Vimcal touted to be the quickest and fastest calendar app ever.
United States
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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Calindori is a touch-friendly calendar application. It has been designed for mobile Linux devices but it can also run on desktop environments. Users of Calindori are able to check previous and future dates and manage tasks and events.
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Kurrier is a modern, self-hosted workspace for email, calendar, contacts and storage.
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Calendarscope is a full-featured calendar software for planning, managing, and scheduling appointments, meetings, birthdays, vacations, special events. It allows you to view all your events in a daily, weekly, monthly, or yearly overview.
Russia
A lightning-fast utility to calculate ISO 8601 calendar weeks, reverse-lookup dates, and generate embeddable website widgets.
You can view an entire month or focus on a specific date and time.
You can also assign colors for different calendars and to-do lists, and drag-and-drop events between dates or years. Yahoo! Calendar gives you more control to share your calendars and events. You can control how.
