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

Manage your schedule

配置您的电子邮件，联系人和日程表

A simple kanban-styled planner

Personal organizer

A simple graphical tool to purge old events from CalDAV calendars

An amazing calendar widget

A time related task manager

Ethiopian calendar

A Persian/Jalali/Farsi calendar