KB1GW's contest-related software links:

N1MM Logger Great software for the 'search & pounce' contester--and its free!
"The N1MM Logger is a freeware program designed to do contest logging and some general logging. It is not a general logging program with award tracking etc. but it is mainly a contest logging program."
This program works really great when interfaced to the Internet and to my Kenwood TS-850S. Makes contesting fun! --KB1GW

Voice Keyer by SM3WMV
"The Voice Keyer is a free Windows -based voice keyer. It is very easy to use and it handles up to 7 messages. By connecting your computer soundcard to your radio it's possible to just press a button and the computer will CQ for you, to spare your voice. It can also PTT your radio via the LPT port."

Writelog for Windows
"Contest logging software for winning CW, SSB, RTTY, and PSK31."

CT by K1EA" is free now!
"CT has been the recognized leader in contest logging software since 1985. CT is designed for ease of use, with its primary emphasis on RELIABILITY.
Several levels of protection are afforded to ensure that you won't lose your contest log in the heat of battle."

TR Log by N6TR
"TR LOG is a high-performance Amateur Radio contest logging program designed to make the most of your computer during a contest. It is designed so that the process of making and logging contacts is as efficient as possible - so you make more contacts."

NA by K8CC
"NA is an amateur radio logging program for MS-DOS computers, primarily for use in operating in amateur radio contests. The operator selects the type of contest to be operated - the rules for the contest are defined by a Contest Rules Template. NA is designed for computer logging, duping and checking in real time during the contest, with automatic preparation of the log paperwork afterwards. This program can form the basis of an integrated system for amateur radio contesting, sending CW from the computer, controlling an external voice keyer, interfacing to a PacketCluster™ system for multiplier spotting, and controlling certain computer-controlled radios." NA is also available here: Radioware & Radio Bookstore

MacLoggerDX for Apple computers... "The Swiss Army Knife of Amateur Radio !"
"MacLoggerDX logs into your favorite Telnet or TNC DXCluster and as DX Spots are received, tunes your radio to the spot, looks up the call and displays the DX station on the Grey line Map with distance and bearing from your station. If you decide to work the station, MacLoggerDX is ready to instantly add the QSO and your Radio's VFO information to your log and can swing your beam around to work the station."

Amateur Contact Log by N3FJP
"Amateur Contact Log is an easy to use general logging program that has many great features including tracking of worked all states, counties and countries."
On the left-hand side of this page, you'll see links to N3FJP's contest-specific loggin programs, including his: 10 Meter Log, 10-10 QSO Party Log, ARRL 160 Meter Log, CQ 160 Meter Log, CQ WPX Log, CQ WW DX Log, Field Day Logs, FISTS Sprint Log, IARU HF Log, International DX Log, Kids Day & Kids Roundup and his NAQP Log.

RCKLog for Windows by DL4RCK and a group of beta testers from the Bavarian Contest Club.
"RCKLog for Windows incorporates many advanced features that create the ultimate contesting tool for novice and expert alike. It is a powerful contest logging program for every ham, from single-operator to multi-multi. RCKLog is designed for ease of use, with its primary emphasis on reliability. The process of working and logging contacts is as streamlined and efficient as possible - so you make more contacts." Also see their RCKLog for RTTY, PSK31, PSK63, Pactor, Amtor and CW, at: RCKLog for RTTY

YPLog by VE6YP.
"YPlog for WIN95/98/ME/NT/2K is a ham radio logging and radio control program. The control panel works with all Icom, Kenwood, some Yaesu and Ten-Tec radios. If no compatible radio is available, the logging features may be used without a radio connected. Extensive contesting features are included for many international contests." YPLog is shareware: "If you are an unregistered user, YPlog is restricted (i.e. the cw keyboard, contesting, and a few cosmetic features are disabled)." Cost: $50 (US) to register: After registration, YPlog is automatically upgraded for use with all contests, and other extended features are enabled.

Logger Free software by K4CY (and others).
(I'm not sure how often this particular software gets updated.)