aCalendar, Fantastical, BusyCal, DigiCal, Cozi, Cron Calendar, Calendar Lock PEA, Fossify Calendar, Amie, Teamup Calendar, One Calendar, Me Calendar, CalenGoo, Sunrise Calendar, WebCalendar, GroupCal, Timepage, Microsoft Entourage, OneView Calendar, Simple Calendar, jquery-calendar, Nextcloud Calendar, GNOME Calendar, 30 Boxes, SSuite My Calendar Diary, Woven Calendar, GMinder, Clean Google Calendar, CalendarWiz, qOrganizer, Google Calendar Checker, Calbird, MemoCalendar.net, Caliander, Plain Today Calendar, iCalViewer, Kin Calendar, vircorX, HipCal, 1calendar, Calvetica, Spicebird, KeepTime, AnCal, Merge Calendar, PreMinder, Handy Calendar, Polar Liquoo, Visual Calendar for Tablets are some alternatives to Apple Calendar.