Ham Radio Deluxe (HRD)is a free computer aided tuning (CAT) application written for Windows 2000 or higher (XP, Vista). Internet Explorer 6.0 or higher is required. Digital Master 780 (DM780) is a multi-mode program supporting the most common digital modes such as PSK, RTTY, and MFSK. DM780 is part of the HRD software suite, and is designed to work with Windows 2000, XP and VISTA, also integrating nicely with HRD above. »hrd.ham-radio.ch/ Freeware.

See this thread for images and more HRD info:
»HRD - Ham Radio Deluxe

TRX Manager is an original and innovative control and logging program that operates under any 32 bit or 64 bit version of Windows (NT3.51 excepted). »www.trx-manager.com/ Shareware ($79 US to register).

MixW is a multi-mode multi-functional software for every day logging and contests. It has many useful features that make your QSO logging process almost a 100% automatic procedure. Windows 9x, ME, NT4, 2000, or XP required. »www.mixw.net Shareware ($50 US to register).