DDay.iCal is an iCal (RFC 5545) class library for .NET 2.0 and above, Silverlight. It aims at being as RFC 5545 compliant as possible, while targeting compatibility with popular calendaring applications, like Apple iCal, Outlook 2007, etc.
EasyTask is a modular PIM (personal information management) system. The goal of this project is to provide simple, clean and yet flexible solution to suit the needs of people who want to organize their life.
All-in-one organizer (todo lists, events, shopping lists, reminders...) written as a desktop application + PocketPC version. Ability to synchronize data on desktop and Pocket PC.
tziCal is a conversion utility for converting time zone data from the tz (Olsen) database to iCalendar (.ics) files. See RFC 2445 for details on iCalendar files and VTIMEZONE components.