Apple Mail
Microsoft Outlook
Thunderbird
eM Client
Mailbird
Gmail
Postbox
ProtonMail
Ominder
Simple Calendar
Lightning Calendar
GMinder
Calendar Lock PEA
SSuite My Calendar Diary
UKs Kalender
Desktop Calendar
Apple Mail OminderMicrosoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Lightning Calendar - Organize your life — it’s about time!
eM Client - eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat.
GMinder - GMinder is an open source Windows System Tray app that pops up to remind you about Google Calendar events.
