Calendar apps for Linux

Birdtray

System tray new mail notification for Thunderbird

Calendar Chat ContactManagement

Betterbird

A better version of Thunderbird

Calendar Chat ContactManagement

ConfClerk

ConfClerk is an application which makes conference schedules available offline

Calendar Office

Capsule

Medication tracker

Utility MedicalSoftware Calendar

Calendar

Manage your schedule

Office Calendar Core

Dosage

Keep track of your treatments

Utility MedicalSoftware Calendar

Events

Manage your schedule

GTK Calendar Utility

Evolution

Manage your email, contacts and schedule

Office Email Calendar

Gahshomar

A Persian/Jalali/Farsi calendar

Office Calendar

Kapow Punch Clock

Keep track of time spent on projects

Office Calendar

Osmo

Personal organizer

Office Calendar ContactManagement

Planify

Forget about forgetting things

Utility Office ProjectManagement

RedNotebook

Graphical diary and journal

Office Calendar

Schedule

A simple kanban-styled planner

Utility Office Calendar

Time Tracker

Track and sync time, local-first

Office Calendar

Thunderbird

Thunderbird is a free and open source email, newsfeed, chat, and calendaring client

Calendar Chat ContactManagement

Vivaldi

Feature-packed web browser

Network WebBrowser Email