Productivity - Desktop Calendars (8)

Mozilla Thunderbird is a skinnable, feature-rich email, calendar, task and instant messaging client with support for plugins and many protocols. It comes with advanced search tools, message filtering, Bayesian spam detector, built-in spell checker, mailbox compression and many more. Program features can be extended with add-ons, including a specialized version of email encryption tool GPG.

Email protocols include SMTP, POP3, IMAP4, NNTP and RSS and chat support for IRC, Twitter, XMPP and Google Talk.

Mozilla Thunderbird, Portable Edition is a special build licensed by Mozilla. Alternatively, X-Thunderbird is also available.

Rainlendar is a skinnable, easy-to-use calendar that resides on your desktop and shows the days of the current month. You can add events and tasks with customizable icons and formats to the calendar and be reminded when they occur. Rainlendar uses the standard iCalendar format to store its events and tasks so you can easily transfer them between applications.

Cross-platform (Windows, Linux, OS X).

Note: Rainlendar Lite is the freeware version of Rainlendar Pro (Payware). The lite version is missing network shared calendars, Outlook support and other features.

T-Clock enhances the clock on the Windows taskbar. You can customize the display, define actions to perform on mouse clicks/drops, set multiple alarms, show calendar, manage windows etc.

T-Clock Redux is an enhanced fork of Stoic Joker's T-Clock 2010 which is a successor of TClock, originally written by Kazubon in the early 90's.

WalCal modifies a copy of your current wallpaper to include a static calendar. The program then sets this new version as your current wallpaper. Unlike other calendar tools, once created it takes up no CPU or memory.