Latest stable release: https://www.jjazzlab.org/en/download/
New features:
- builtin ready-to-use synth based on FluidSynth
- notes editor (e.g. easily customize the bass line on the chorus)
- bar annotations (e.g. add lyrics or improvisation tips)
- export to audio
- ...
There is also a brand new flatpak (thanks to wvengen) , testers welcome ! https://flathub.org/fr/apps/org.jjazzlab.JJazzLab
Source code: https://github.com/jjazzboss/JJazzLab