Free Music Software

Circle Synth was uploaded by: Mahto
Duration: 181
Rating:

d-touch Drum Machine with walnuts was uploaded by: audiodtouch
Duration: 87
Rating:

ModBox (App Store link) is a free universal Tracker Format Player for the iPhone that plays Amiga and PC module music (e.g. Protracker, Fasttracker, Screamtracker). It features a song database with direct-download from various authors, an integrated FTP Server and support for all common module formats (e.g. Protracker, Fastracker, Screamtracker, etc.).

Knobster has released another bizarre free virtual instrument for Windows,  Mellofan.
Mellofan is something like a cross between a Mellotron an a household fan, letting you play music with the sound of a fan.
Features:

Adjustable ‘melodiousness’
Adjustable frequency and amount of rotation
ADSR-envelope
LP filter

via SonicState

UVI Workstation is a free multi-timbral instrument that provides unlimited parts, integrated effects, live performance features, and a smooth real-time workflow.
In a nutshell, they’re giving away their software workstation for free and hoping that you’ll like it enough to buy Soundpack downloads.
UVI Workstation main features:

New UVI Engine XT design provides superior sound quality and functionality.
100% [...]

Velosynth is a bicycle synthesizer, designed to form  “a cognitive loop between the cyclist and their microlocal transportation environment.”
You may not have realized that you were missing that “cognitive loop between the cyclist and their microlocal transportation environment.” But now you know.
A sensor detects the rotation of a spoke-attached magnet. this data is translated into [...]

Krolar SX-2 is a freeware VST instrument for Windows, inspired by the Roland SH-2.
Features:

OSC1: sine/saw/pulse.
OSC2: saw/pulse/noise.
SubOsc: square (-1 oct below the settings of OSC1).
4pole LP self oscillating filter.
Modulator (LFO): sine/square/S&H with rate and delay.
AutoBend: begins below/above (-2/+2 octaves) key pressed and slides to that pitch.
PWM: LFO/Man/Env – the slider adjust the pulse width or [...]

The Prodigy have released a free iPhone app (App Store link).
Description:
The official ‘The Prodigy’ application for the iPhone and iPod touch.
This application is an avenue for mobile fans, connecting you to the latest information about The Prodigy, including other digital assets.
This release includes:

Audio player with iTunes purchasing capabilities
The latest news
Lyrics
Bio
Pictures
Tour dates
Video
Official links

If you give it [...]

SuperCollider: a 60-second intro was uploaded by: mcldx
Duration: 60
Rating:

This video demonstrates using an iPhone to control Native Instruments Reaktor via Open Sound Control.
Resources:

Native Instruments Reaktor (Mac)
TouchOSC (iPhone)
Reaktor synthesizer designed by Tony Wallace