From W3C Wiki

ImmersiveHypertextEditing is sometimes better with a richer user interface for a more constrained form of hypertext; for example, calendar user agents have special widgets for navigating from day to day, week to week; for choosing timezones; for displaying various views.

Combined with RdfCalendar conversion tools, iCalendar user agents are AuthoringToolsForRDF. Some notes on tools that seem to work:

iCal (from Apple)
only runs on Mac OS X 10.2 (aka "Jaguar"), but it's interoperable (modulo a few bugs/glitches: missing timezone components reportedly fixed in v1.5.1) with open source tools, so popular data sources fueled by it such as iCalShare (which lists over 1400 different iCalendars) are quite useful. (@@grumble about bogus webcal: URI scheme). ical home
Ximian Evolution
open source; linux/unix. evolution home. v2 adds subscription support, though there seem to be performance issues.
Mozilla Calendar
open source. linux and windows platforms supported (fall 2002) with mac suport in the works. supports RDF export (via XSLT). mozilla calendar project home. also: The Sunbird Project - Standalone Calendar. Seems to follow apple in treating webcal: as a synonym for http:
freeware for Windows 98+ eventSherpa imports, exports and subscribes to iCalendar and RDF. Publishing iCalendar or RDF requires subscription to service.

These read .ics data, but they don't do the cool subscribe thing:

KDE Korganizer
open source; linux/unix/windows. korganizer based on QT by TrollTech which is open source for linux and closed source commercial for windows. QT allows to address arbitrary calendars by URI and korganizer allows mixing of calendars.

how? pointers to docs? I can't figure out how to subscribe to a calendar in korganizer.

In the calendar subwindow, click on "add" and in the download from box just put in the URL for the calendar you want to and and voila!

Calendar:Lightning - From Meta; discussion about Wikimedia projects

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