3000 Year Parallel Calendar

I recently ran across this nifty freeware calendar program called the 3000 Years Calendar. With it one can view 4 parellel calendars:Julian, Gregorian, Jewish and Islamic for any date from 1-3000 CE. It also shows phases of the moon.

The same website also offers a shareware 7000 Year Calendar, which has many more calendars available (Julian, Byzantine, Gregorian, Indian, Ancient Egyptian, Coptic, Ethiopian, Jewish/Hebrew, Islamic, Khayam, Persian, Slavic-Aryan. All from 4712 BCE-3000CE) and more options. You can download a free trial version from the link above.
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Both programs seem useful, but if you're looking for a good Jewish Calendar program I don't think you can go wrong with Aish.com's free AishLuach, which is free for download at thier website.