Windows

AnalogX Music software downloads
Includes plugins, MIDI utilities, and music utilities.
http://www.analogx.com/contents/download.htm

Azam IT
Voice recording and management solution for improving communication.
http://www.azamit.com

Groove Mechanic
Restores audio from LPs and tapes by removing clicks, pops, and hiss.
http://www.coyotes.bc.ca/

iTunesControl
Provides global hotkeys and additional features to iTunes on Windows.
http://itunescontrol.com/

MED Soundstudio
Amiga tracker OctaMED now has version for Windows (called MED Soundstudio). Mod music files too.
http://www.medsoundstudio.co.uk/

NCH Swift Sound
Business applications for voice services. Freeware utilities including WavePad and a tone generator.
http://www.nch.com.au/

NetCat AG's Instrument Tuner
Verify or tune up any musical instrument from a laptop. Also supports custom tunings.
http://www.netcat.li/instrument-tuner/index.html

Psycledelics
Free music software based on tracker interface, with DSP effects, plugins, and VST support.
http://psycle.pastnotecut.org/

Urge
Downloadable content from MTV, VH1 and CMT in Windows Media Player format.
http://www.urge.com/