One Calendar is described as 'View all your Google, Outlook, iCloud, and Office365 calendars in one place. Manage events, birthdays, and appointments with seamless integration' and is a Calendar app in the office & productivity category. There are more than 50 alternatives to One Calendar for a variety of platforms, including Web-based, Android, iPhone, Windows and Mac apps. The best One Calendar alternative is Google Calendar. It's not free, so if you're looking for a free alternative, you could try Google Calendar or Fossify Calendar. Other great apps like One Calendar are Simple Calendar, Apple Calendar, Morgen and Right Calendar.
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.
Germany
EU
NetherlandsEU
CalenGoo gives you a fast and easy way to access and change your Google Calendar (or Google Apps Calendar) with your Android device. It can either work with the built-in calendar or it can sync directly with Google.
Somiya is an ad-free family organizer for iPhone — a shared calendar and lists where one person adds something and everyone sees it instantly, with reminders that reach the whole family, working offline and hosted in the EU.
CyprusEU
WebCalendar is a PHP-based calendar application that can be configured as a single-user calendar, a multi-user calendar for groups of users, or as an event calendar viewable by visitors.
GermanyEU
Unlike other calendar programs, Teamup does not require any user account. No signup, no login. Access to Teamup Calendar is as simple as opening a calendar link in your web browser. The calendar links can be shared with as many users as needed.
Switzerland
Google Calendar Repair, Editing & Maintenance: Delete Duplicates, multiple edit and delete, search/replace, undo failed import and sync and more!.
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
SSuite My Calendar Diary Portable is a software utility whose purpose is to provide individuals with a simple means of keeping better track of their schedule.
South Africa
