SmartSound Software, Inc.
- Sonicfire Pro 4 with Mood Mapping, music scoring software, and royalty-free music for video productions.
- http://www.smartsound.com

The Palette
- Melody composing tool uses composition and harmony theory to help composers develop phrases, sentences, periods, and motifs.
- http://www.palette-mct.com

Rhythm Rascal
- Create drum tracks using any sample WAV files as drum sounds. Flexible, although designed mostly for Rock and Metal.
- http://www.rhythmrascal.com

Hard Note JUMP
- Streamlined MIDI sequencer that focuses on composition rather than audio production. Demo available.
- http://hardnote.com

ComposerTools.Com
- Free on-line tools including 12-tone row analysis and pitch class. Also "MusicGraph" a tool for graphing music across dimensions.
- http://composertools.com

Drumsite
- Drum track creation tool, supports multiple samples and effects.
- http://www.guitar.sk/drums/drums_main.htm

Chord Arranger Pro
- Creates styles from any MIDI file and is able to identify chords and convert song measures into style parts.
- http://www.xdigits.com/midi/rmca.html

Pymprovisator
- For jazz. Set song parameters and program generates MIDI file with adequate accompaniment. Freeware.
- http://pymprovisator.sourceforge.net

TaalMala and SwarMala
- Compose Taal (loops) with Tabla and Pakhawaj (Indian drums). Export to WAV or MP3. Also offers the SwarMala sequencer.
- http://taalmala.com

Virtual Studio Systems
- Offers Lyricist and TrackNotes for musicians, songwriters, and home recording.
- http://www.virtualstudiosystems.com/

Compo
- Composition system based on common LISP, generates MIDI and scores.
- http://compo-music.net/en/accueil.php

Ixi Software
- Prototypes and apps for composition of experimental music.
- http://www.ixi-software.net/

Swar Systems
- Create music using Indian melodies and scales. Supports up to 8 instruments.
- http://www.swarsystems.com/

AudioMulch
- Interactive musician's environment offers music composition by sound synthesis and "contraptions".
- http://www.audiomulch.com/

ARiADA Project
- Researches composition strategies for electroacoustic music.
- http://ariada.uea.ac.uk/

GrooveLab
- Make your drum loops online.
- http://artopod.com/groovelab/

Frameworks and Environments
- Academic paper defining data structures for general concepts of composition, sound synthesis, networks.
- http://www.ircam.fr/equipes/repmus/RMPapers/Hanappe97/

QuantumPortal
- Free software "Blending algorithmic techniques with contemporary Music Theory to "air brush" compositions."
- http://quantumportal.com/

Aspire - Music MasterWorks
- [Win] Description and order information of this voice-to-note composing software.
- http://www.musicmasterworks.com/