There's MonoCalendar which looks relatively decent. And Mozilla (of Firefox fame) has a Calendar project.
Both of them should be free, and in terms of prettiness, Mozilla is probably on top. I'm pretty sure that both of them involve separate windows, though.
In terms of desktop-floating type calendars, the only one that I'm familiar with is Desktop iCalendar Lite - and I'm not sure if you can actually add events from the desktop, or if it only works by syncing with an external calendar app, like Mozilla Sunbird.
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Both of them should be free, and in terms of prettiness, Mozilla is probably on top. I'm pretty sure that both of them involve separate windows, though.
In terms of desktop-floating type calendars, the only one that I'm familiar with is Desktop iCalendar Lite - and I'm not sure if you can actually add events from the desktop, or if it only works by syncing with an external calendar app, like Mozilla Sunbird.