Calendar Maven
   Complete information about "Hebrew Calendar" software products, including "Hebrew Calendar for Windows" and "Hebrew Calendar Date Converter ActiveX Control." Evaluation copies available for download.
   http://www.calendar-maven.com

Hebcal Interactive Jewish Calendar
   Interactive web interface for generating a list of Jewish dates and times customized to zip codes, converting between Hebrew and Gregorian dates.
   http://www.hebcal.com

Hebcal Jewish Calendar
   Complete Hebrew calendar program for Unix and Windows. Candlelighting times, holidays, Omer counts, and Torah readings. C and Perl source code available, as well as a Windows executable and links to Web versions of the software.
   http://sourceforge.net/projects/hebcal

Hebrew/English Calendar with Candle Lighting Times
   Perpetual calendar for thousands of locations world-wide.
   http://www.chabad.org/calendar/

Jewish Calendar
   Interface for finding dates in the Hebrew calendar, with holidays and memorial days. Uses PHP calendar software.
   http://mike-r.com/%7erechtman/jh.html

Jewish Calendar on the Web
   Converts dates between Jewish and civil calendars; displays monthly calendars and candlelighting times for different geographical location.
   http://www.hebrewcalendar.net

Jewish Holidays
   Dates of all major and minor Jewish holidays and fast days, with explanations, observances, and links to other articles of interest. From the OU.
   http://www.ou.org/holidays

Jewish/Civil Calendar Program
   Interactive Web program that prints out Jewish and Civil calendars side-by-side. Does not list holidays in either calendar. Source code available.
   http://www.uwm.edu/~corre/calendar.html

Kaluach
   Hebrew and english calendar for Windows. Displays a Hebrew or civil month with holidays, Shabbat portions, and halachic times. User data can be added.
   http://www.kaluach.org

Kaluach.net
   Online Hebrew civil calendar portal. Also receive email reminders of holidays and personal events.
   http://www.kaluach.net

This Month in Jewish History
   List of notable events in Jewish history, organized according to Gregorian calendar dates.
   http://www.wzo.org.il/en/resources/expand_subject.asp?id=144