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, IMAP (including uploads, albeit a date issue), NNTP and RSS and chat support for IRC, Twitter, XMPP and Google Talk. Having OAuth support, it can be used with accounts that require it instead of a password.

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

UK's Kalender is a personal calendar that sits in the system tray and reminds you of upcoming events or deadlines. Events can be displayed in weekly, fortnightly, monthly or yearly view. They can also be organized into different categories with their own settings. Documents or programs can be attached to an event so that they are automatically launched when the event fires. The program also allows sharing via network (multi-user).

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.