Calendar and Date/Time
Let's show the calendar color on Lightning reminders!
Tired to mistakenly press that "Dismiss All" button? Move the Lightining Reminder "Snooze all for" and "Dismiss All" buttons to the LEFT!
... and from version 2.0 you can keep them on the RIGHT, but swapped!
A simple week view for Lightning, as in the print layout.
Montezooma is a Thunderbird Addon that adds zooming functionality to windows.
NirvanaHQ for Thunderbird
Copy Reminder List To Clipboard No Restart
Provides button to copy the list of current reminders to the clipboard.
Finds when are people available for a meeting or event via Zonio Freebusy service. Displays freebusy blocks instantly in Invite Attendees window while attendees are being added. Works with both local calendar storage or any calendar provider.
Activity logger (sampled task monitoring) which uses calendar to store user's activities.
It periodically displays window with textbox where user can put description of currently performed tasks. The description is saved in a calendar.
Allows two-way access between Remember The Milk and calendar events or todo items.
Sidebar that shows a single web page. This allows Thunderbird to be augmented with any user-supplied or third-party web page. The screenshot shows an example - I use my own custom web page to present my Google Calendar in my preferred format.
OBM Lightning Calendar and addressbooks connector
This plugin allows you to synchronize addressbooks and contacts stored on the DM mail server
Macro Template No Restart
Macro Template is to replace mail templates with macros for date formatting.
Integrates calendars events with Gnome clock applet
Plugin may hang on Fedora.
As a workaround uninstall evolution-ews.
This addon is now integrated into the new address book CardBook : https://addons.mozilla.org/thunderbird/addon/cardbook/ (and thus it is no longer maintained)
NoiaButtons No Restart
The 'NoiaButtons' add-on offers cartoonish toolbar button icons (known from Noia themes) for default theme and lightweight themes. Further more lite silver and dark versions of Noia themes are included.
True "Send Later" functionality to schedule the time for sending an email.