Calendar
Birdtray
System tray new mail notification for Thunderbird
Deepin Calendar
Calendar is a date tool.
Event and task manager
Manage events and tasks using simple text files
Calendar
Calendar for GNOME
Evolution
Manage your email, contacts and schedule
Plan
Project Management
KOrganizer
KOrganizer is a calendar and scheduling application
Osmo
Personal Organizer
Periodic Calendar
Utility for tracking menstrual cycles and predicting fertility periods
WebIssues
Desktop Client for the WebIssues team collaboration system
Orage Calendar
Desktop calendar
Xgnokii
Manage your mobile phone