Band-in-a-Box - Band-in-a-Box is so easy to use!
Suggester - Suggester is a tool to assist in the creation of songs and chord progressions.
KGuitar - Kguitar is a guitar tablature editor for Linux, featuring:
Chordjam - Creative music composition tool for desktop and iPad.
Pretty Captions - Create beautiful captions for Instagram and other platforms
ChordBud - "ChordBud is an all in one app that combines most important concepts when sketching a song.