Tone Generator
NCH Sound Tone Generator lets you create audio tones, sweeps or noise waveforms using a Windows computer with a sound card or a PocketPC handheld. Typical Applications include test tone generation in studios for the alignment of levels, calibration and testing of audio equipment or speakers,... ~ Tone Sweeps (Log or Linear). ... ~ Plays tone or saves as wav file. ... ~ Mono or separate stereo operation (ideal to create dual tones or 'beats'). ... ~ Supports frequencies from 1Hz to 22kHz bandwidth (subject to sound card).
http://www.audiochannel.net/software/tn.zip - 120Kb - Download - Screenshot

Guitar Tuning Fork
Guitar Tuning Fork is musical tone sound generator program for musicians. User can get sound of six open guitar strings tones and A4 tone (440 Hz). There is volume control in this program. Author is professional musician (guitar player and singer). OS Windows 98/ME/XP/2000/2003. ... Sound card must be installed on your PC.
http://www.yellow-gold-soft.com/distrib/GTF.zip - 82Kb - Download - Screenshot

Test Tone Generator
The Test Tone Generator (TTG) turns the PC into a function generator for testing or demonstration, sound tuning, education and many other purposes.
http://www.esseraudiosolutions.com/TTG_Setup_en.exe - 810Kb - Download - Screenshot

1.0 Ring Tone Maker Factory
Tired of paying each time you want a new Ring Tone? Ring Factory allows you to create ring tones from any CD or MP3 you have and also allows you to choose from hundreds of real recording artists. Also choose from the hottest wallpapers online. Make as many changes as often as you want. ... Software Features: * Create Ring Tones from your favorite songs or sounds * Upload your own wallpapers * Or choose from the hottest wallpapers online! ... * Unlimited use - upload new ring tones and wallpapers as often as you like Cell Phone Requirements: Ring Factory is 100% wireless carrier independent...
http://www.ringfactory.net/app/RingFactorySetup.exe - 4Mb - Download - Screenshot

Guitar-Online Tuner
This guitar tuner allows standard and open* tunings. The program shows the name of the note, together with its place on the stave, and numerical values of pitch/frequency. If the open tunings doesn't fit your needs, you can use the keyboard (in chromatic mode) and choose any other note to tune...
http://www.guitar-online.com/demos/data/tuner-demo.exe - 987Kb - Download - Screenshot

DTMF
DTMF dial is a software program designed to emit DTMF tones (including A, B, C and D) from the PC sound card. It has push button, keyboard, clipboard paste and command line interface - with programmable memory, last 16 number redial and tool tray operation. ... Tone lengths, gaps, pauses and prefix can be easily configured.
http://www.freesharewarecenter.com/files/df.exe - 665Kb - Download - Screenshot

DTMFDial
Emits DTMF tones including A, B, C and D using PC sound card with flexible push button, keyboard, clipboard paste and command line interface - now with programmable memory, last 16 number redial and tool-tray operation. Tone durations, gaps, pauses and a prefix are fully configurable. ... Single instance operation as shell command line utility.
http://www.silverstones.com/SetupDial.exe - 666Kb - Download - Screenshot

Mac classic Guitar tuner
Free guitar tuner, for tuning acoustic and electric guitars, from GCH Guitar Academy. Has a selection of tones to tune from, electric guitar, acoustic guitar and pure tone. Best of all it's completely FREE.
http://www.gch-guitaracademy.co.uk/freeware/mac/tuner_mac.zip - 3Mb - Download - Screenshot

Mac OSX Guitar tuner
Free guitar tuner, for tuning acoustic and electric guitars, from GCH Guitar Academy. Has a selection of tones to tune from, electric guitar, acoustic guitar and pure tone. Best of all it's completely FREE.
http://www.gch-guitaracademy.com/freeware/mac/tuner_osx.zip - 3Mb - Download - Screenshot

MoodBook
MoodBook is a tiny Windows utility that brings art to your desktop and sets a tone for your daily mood and emotions! With MoodBook your desktop looks like an art gallery changing art expositions either automatically, at regular time intervals, or manually, with a click. ... Abstract art pictures have a major impact on your perception, as well as, the desktop background itself sets a tone for your mood, influencing deeply with the color. ... Additionally, MoodBook is designed to help you control your sense and mind, set a tone for your mood, and adjust your mental state.
http://www.moodbook.com/mb.exe - 2Mb - Download - Screenshot