Top Alternatives to Google Calendar

Lightning App Builder is a point-and-click tool that makes it easy to create custom pages for Salesforce1 and Lightning Experience.

Rainlendar is a calendar program for Windows, Mac OS X and Linux.

Kolab is a free and open source groupware suite.

Kontact is a personal information manager and groupware software suite developed by KDE. It supports calendars, contacts, notes, to-do lists, news, and email.

Jorte is a calendar application.

fruux is a cross-platform synchronization service.

Business Calendar is a calendar app specifically for business users.

Calvetica is a fast calendar for iPhone and iPad.

Etar is a material design calendar.

VueMinder Calendar is a calendar app for Windows.

Calendar is a online calender platform.

Holiline Reminder is a free software calendar program for Windows.

Microsoft Mail and Calendar apps help you stay up to date on your email, manage your schedule and stay in touch with people you care about the most.

MIDAS is a web based room scheduling software.

KOrganizer is the calendar and scheduling component of Kontact, the integrated personal information manager from KDE.

BusyCal is a calendar app for mac.

FCorp My Calendar is a free software to manage a diary, notes, schedules, birthdays, etc.

aCalendar is a calendar and task management applications.