Google Calendar, aCalendar, Apple Calendar, BusyCal, Rainlendar, DigiCal, Cozi, Microsoft Mail and Calendar, Morgen, Calendar Lock PEA, Woelkli, MIDAS, Lightning Calendar, Business Calendar, timegrid.io, One Calendar, Me Calendar, Desktop Calendar, WebCalendar, Simple Calendar, Jorte, Nextcloud Calendar, Touch Calendar, UKs Kalender, GNOME Calendar, Zoho Calendar, BORG Calendar, 30 Boxes, SSuite My Calendar Diary, gsimplecal, fruux, FCorp My Calendar, OrgBusiness Software, Kalendar, Calvetica, Calendarscope are some alternatives to Fossify Calendar.