Groove Mechanic

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

NCH Swift Sound

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

AnalogX Music software downloads

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

MED Soundstudio

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

Psycledelics

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

Timo Esser's Audio Software

Tone generator, instrument tuner, rife signal generator, hearing tester.
http://www.esser.u-net.com

Azam IT

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

PC Keyboard Music

Play MIDI musical instruments with a PC "qwerty" keyboard.
http://kmxuyi.vip.myrice.com

Universal ASIO Driver for WDM Audio

Freeware Audio Streaming Input and Output driver that works with consumer grade audio hardware.
http://michael.tippach.bei.t-online.de/asio4all/

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

Akram Soft

Audio editor and converter, CD burner.
http://www.akramsoft.com/

iTunesControl

Provides global hotkeys and additional features to iTunes on Windows.
http://plaza.ufl.edu/morrowc/itunesctl/itunesctl.html