DAKboard, Google Calendar, Fantastical, Tuta, Notion Calendar, DigiCal, Cozi, Morgen, Calendar Lock PEA, Greg, Fossify Calendar, Calendar Buddy, Proton Calendar, DeskTask, wtplan, HEY Calendar, YouCanBook.Me, CalenGoo, Desktop Calendar, GroupCal, do-Organizer, Desktop iCalendar, Simple Calendar, Nextcloud Calendar, Reminder Commander, UKs Kalender, RemindMe desktop calendar, GNOME Calendar, Active Desktop Calendar, Zoho Calendar, BORG Calendar, Outlook on the Desktop, 30 Boxes, Attendexer, SSuite My Calendar Diary, GMinder, gsimplecal, qOrganizer, Google Calendar Checker, GMX Calendar, ChronoFlo Calendar, MemoCalendar.net, SyncSlot, HipCal, KeepTime, ReminderFox, Calendarific, Calendarscope, PreMinder, OrgCalendar, Family Tasks, Handy Calendar, Visual Calendar for Tablets are some alternatives to Rainlendar.