Desktop iCalendar!

Microsoft Outlook, part of the Microsoft Office Suite (not to be confused with Microsoft Outlook Express), is a personal information manager that lets you manage your e-mail, calendar, contacts, and tasks.

Rainlendar is a feature rich calendar application that is easy to use and doesn't take much space on your desktop. The application is platform independent so you can run it on all major operating systems: Windows, Linux and Mac OS X. The appearance can be customized with skins and you can even mix different skins together. It is possible to use Rainlendar with other calendar applications too. Rainlendar uses the standard iCalendar format to store its events and tasks so you can easily transfer them between applications. You can also subscribe to online calendars including the Google Calendar and edit your Outlook appointments directly in Rainlendar*. »

Plasma Workspaces is the umbrella term for all graphical environments provided by KDE. Plasma separates components into "data engines" and their visualization counterparts. This is intended to reduce the total programming effort when there are multiple possible visualizations of given data; and to make it easier for the data engine and the workspaces to be written independently. Currently there are three workspaces being developed: Plasma Desktop for traditional desktop PCs and notebooks, Plasma Netbook for netbooks, and Plasma Active for tablet PCs and similar devices. »

Take control of your schedule and get reminded wherever and however you want. Instantly access your appointments, tasks, and notes with a simple glance at a transparent calendar that sits right on your Windows desktop. Share calendars and reminders in your home, office, or online. Automatically synchronize with Google Calendar and Outlook. Print calendars using a wide variety of layouts and styles. You can do all these things and much more with VueMinder Calendar.

This program helps you organizing your dates and tasks and reminds you of upcoming events.

This application is a software calendar with appointments notes, tasks, alarms and contacts that provides seamless integration and interactivity with the desktop background. You can organize your data in layers and share them with other people on a local area network.

BORG is a combination calendar and task tracking system. The calendar supports all sorts of appointments and also a simple todo list. The calendar functionality is similar to that of other PIMs, such as Microsoft Outlook, Mozilla Calendar, Palm Desktop, Yahoo Calendar, etc... The Task Tracker goes way beyond todo's and might better be called a project tracking system.

Holiline Reminder is both an event reminder and a calendar. Holiline’s aim is to ensure that you do not forget about a friend’s birthday, an important holiday, or another significant event. By default, it takes over the taskbar to remind you about important events that are coming up.

30 Boxes is an online calendering tool.

GMinder is a reminder program that waits in your system tray and alerts you when you have an upcoming Google Calendar event.

do-Organizer includes useful tools to improve your experience and qualify you as an achiever. Store valuable information with a versatile, elegant, and customizable data manager. Creatively highlight information with a huge library of quality clipart, icons, and pictures that will enhance every presentation.

If you are a very busy person with a full working, family and social life, then you cannot go wrong with Reminder Commander. The program will help you create a system of reminders for important events such as birthdays, anniversaries, appointments, important phone calls and much more. You will no longer feel pressured about remembering everything as the computer will do it for you. Free your mind for more important tasks, and make your life more efficient!