NtEd - Music Score Notation editor.
Band-in-a-Box - Band-in-a-Box is so easy to use!
DaCapo Editor - DaCapo Editor is a free Open Source music sheet editor which allows to easily create nice looking partitions. It is available as a web application as well as a desktop application for Windows, MacOS and Linux.
LeMMA - LeMMA is a simple GUI “front-end” written in Python for MMA (Musical MIDI Accompaniment – also written in Python). I wrote it so that I can easily churn out chord progressions. Ju…
Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
Microsoft Songsmith - Songsmith generates musical accompaniment to match a singer’s voice.