AIVA - The AI composing emotional soundtrack music
NtEd - Music Score Notation editor.
WaveBots Editor - Procedural music and sound maker that exports to Wav, MIDI, GoatTracker and much more.
music21 - Music21 is a Python-based toolkit for computer-aided musicology.
Noatikl - Noatikl, our evolution of SSEYO Koan, is a deep & powerful app for generative MIDI music composition AND sound design. Wotja is now the future for Noatikl. Software for Windows 10
ABCexplorer - ABCexplorer is a musical creation utility that comes with advanced support to create, edit, play, convert and manage musical files with ABC text format support.