Fractal and Generative
Agentbeats, Algorithmic Arts SoftStep, Algorithmic.net Flexatone, Artificial Life and Music, ArtSong, ArtWonk, Automatous Monk, Blogolith, Clara Empricost, Digimpro
Aspire - Music MasterWorks
[Win]?Description and order information of this voice-to-note composing software.
AudioMulch
Interactive musician's environment offers music composition by sound synthesis and "contraptions".
Chord Arranger Pro
Creates styles from any MIDI file and is able to identify chords and convert song measures into style parts.
Compo
Composition system based on common LISP, generates MIDI and scores.
ComposerTools.Com
Free on-line tools including 12-tone row analysis and pitch class. Also "MusicGraph" a tool for graphing music across dimensions.
Drumsite
Drum track creation tool, supports multiple samples and effects.
Frameworks and Environments
Academic paper defining data structures for general concepts of composition, sound synthesis, networks.
Hard Note JUMP
Streamlined MIDI sequencer that focuses on composition rather than audio production. Demo available.
ProComposer
Editing, recording, design, composition, and playback with audio and MIDI instruments.
Pymprovisator
For jazz. Set song parameters and program generates MIDI file with adequate accompaniment. Freeware.
QuantumPortal
Free software "Blending algorithmic techniques with contemporary Music Theory to "air brush" compositions."
Rhythm Rascal
Create drum tracks using any sample WAV files as drum sounds. Flexible, although designed mostly for Rock and Metal.
Swar Systems
Create music using Indian melodies and scales. Supports up to 8 instruments.
TaalMala and SwarMala
Compose Taal (loops) with Tabla and Pakhawaj (Indian drums). Export to WAV or MP3. Also offers the SwarMala sequencer.
Virtual Studio Systems
Offers Lyricist and TrackNotes for musicians, songwriters, and home recording.