Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Google Calendar - Spend less time managing your day & more time enjoying it
Rainlendar - Rainlendar - Customizable desktop calendar
Mixmax Calendar - The fastest way to schedule meetings with anyone, anywhere
Sunsama - Calendar and scheduling for teams
Gmail - Gmail is available across all your devices Android, iOS, and desktop devices. Sort, collaborate or call a friend without leaving your inbox.