Google Calendar, Calendly, aCalendar, Apple Calendar, BusyCal, Rainlendar, DigiCal, Cozi, Microsoft Mail and Calendar, Scriby, Morgen, Calendar Lock PEA, Woelkli, MIDAS, Greg, Fossify Calendar, Lightning Calendar, Business Calendar, Calendar Buddy, timegrid.io, wtplan, Teamup Calendar, Tockify, One Calendar, Me Calendar, YouCanBook.Me, Desktop Calendar, WebCalendar, When I Work, do-Organizer, jquery-calendar, Jorte, WAVE Calendar, Nextcloud Calendar, Touch Calendar, GCalToolKit, todoyu, UKs Kalender, Holiline Reminder, RemindMe desktop calendar, GNOME Calendar, Active Desktop Calendar, Zoho Calendar, BORG Calendar, 30 Boxes, Attendexer, SSuite My Calendar Diary, Ominder, Koma-Mail, Setmore Appointments, gsimplecal, fruux, CalendarWiz, qOrganizer, GMX Calendar, DHTMLX Scheduler .NET, Day by Day Organizer, FCorp My Calendar, ChronoFlo Calendar, MemoCalendar.net, OnSched, Trumba, Caliander, OrgBusiness Software, Localendar, Maian Events, SyncSlot, Q-IT Team Scheduler, Kalendar, Kin Calendar, vircorX, styleNbook, Calvetica, KeepTime, AnCal, Fabmin, Easy Event, Calendarific, Calendarscope, Bookis, Convenient Calendar, PreMinder, OrgCalendar, WizCal, Draftboard, Handy Calendar, Polar Liquoo, Visual Calendar for Tablets, SortedTime LLC are some alternatives to Simple Calendar.