Free Music Software

DSP Music has released version 3.0 of PSPSeq, a free homebrew application for composing music on the Sony PSP handheld game system.
PSPSeq contains both realtime synthesis and sample playback capability, along with multiple FX modules of widely varying types for modifying instruments in countless ways. PSPSeq also has a powerful and unique step sequencer for [...]

Sonic Visualizer, a free application designed to make exploring audio data as fun as possible, has been updated.
Sonic Visualiser will be of particular interest to musicologists, archivists, signal-processing researchers and anyone else looking for a friendly way to take a look at what lies inside the audio file.
Sonic Visualiser has powerful annotation capabilities to help [...]

The PSP RHYTHM development team has released RHYTHM version 8, a free music sequencer for the PSP.
According to the team:
RHYTHM version 8 has been in development for over one year. We have rebuilt the audio engine from the ground up, making many improvements. The User Interface and controls have also been completely redesigned to streamline [...]

DSK has released a new free virtual instrument for Windows, DSK Indian DreamZ.
Features:

6 Indian Instruments: Sitar, Sarod, veena, Tar, tampura & Tabla
Velocity response
Amp. envelope and micro-detuner
HP/LP Filter
Midi automation

DSK has released another free Windows virtual instrument, DSK Virtuoso.
With DSK Virtuoso you can play combinations of 6 instruments, or play a composition up to 6 different parts, through the MIDI channels selectors.
Features:

6 Instrument layers
Midi channel assignable to each one
ADSR, level and Pan control for each layer
40 instruments in 6 categories
2 [...]

Remain Calm has put together a list of its top 24 music apps for the Nintendo DS:

bliptracker - a drum machine & sequencer
dsmcu - MCU-compatible mix controller
Protein[DS] - sample looper, scratcher, glitcher
nitrotracker
kaosDS - converts touchscreen data into midi over wifi
sampling keyboard
dstep v2 - a visual sequencer
glitchDS - a cellular automation sequencer
repeaterDS - stuttering sample player
midipad [...]

Weepr is a new free music application that is sort of like a software Tenori-On.
Not much information is available yet, and the site is in Italian, but you can download and try Weepr out here. Adobe’s Air is required.
It’s limited in terms of what sounds are available, and timing is a little shaky, but it’s [...]

SPEAR (Sinusoidal Partial Editing And Resynthesis) version 0.7.1 is a free application for Windows & OS X for audio analysis, editing and synthesis.
The analysis procedure attempts to represent a sound with many individual sinusoidal tracks (partials), each corresponding to a single sinusoidal wave with time varying frequency and amplitude.
Something which closely resembles the original input [...]

This video demos WiiAmbient, a free new ambient music program for the Wii from Gleetchplug.
It’s not available yet - but it looks like it will be very cool.

Univers Sons has introduced UVI Workstation - a free, advanced, universal software instrument workstation, and UVISoundsource.com - a new sound download website dedicated to the UVI community.
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 is available now, in beta, so [...]