Contesting: Calendars. WA7BNM Contest Calendar updated pop - Complete listing of upcoming ham radio contests, including rule summaries of this week's contests.
Contesting at Wikipedia - Contesting (also known as radiosport) is a competitive activity pursued by amateur radio operators, read more about contesting at wikipedia
CT Contest Logging Program Utilities - My MMPRINT utility is a post contest tool that lets you extract statistical data from a CT log file
Northern California Contest Club - Specialized amateur radio club devoted to the pursuit of operating and technical excellence in radio contesting
The DXZone.com list in Contesting/Rules a curation of 68 useful links about Contest Rules.
The most popular amateur radio contest calendars online. An essential resource list for serious amateur radio operators involved in radio sport.
Contest program for ham radio contesting events, list of contest software Pages:  1 2 . November Sweepstakes Log - Windows shareware November Sweepstakes Log program
ARRL contest branch - All ARRL contests for current year are listed along to generic ARRL contest calendar is also provided that gives the weekends for all ARRL events.
The DXZone.com list in Contesting/Results a curation of 21 useful links about Ham Radio Contest Results.
The DXZone.com list in Contesting/Software a curation of 66 useful links about Ham Radio Contest Software.