We have selected a few useful calendars to get you started.  We always welcome suggestions for new and useful links to add to our site.

HEBCAL
Useful site does date conversion between Gregorian/Secular calendar and Jewish calendar.  Also has very useful features for adding Jewish Holiday dates to your PDA or other organizing calendar software (e.g. Outlook, Palm).

CHABAD.ORG
Great for exact Candle Lighting times and prayer times

AISH

    AISH Online Calendar for candle lighting times

    AISH LUACH - Downloadable Windows software calendar