'simple' calandar program for .ics imports

Ok, can people recommend a simple PC calendaring program that can import and export multiple ICS (iCal/Google Calendar) files.

Being able to categorize events or even entire ICS inports would be a plus....

I use Essential PIM for myself, but have a need to import, manage, and export external ICS calendars and don't want to pollute my personal calendar with the data.

thanks!