JJazzLab 2.0 (free and open source)
New features
Better sounds thanks to the new high-quality JJazzLab SoundFont
Ready-to-use presets for VirtualMIDISynth (Windows) or FluidSynth (Linux)
Better rendering of Yamaha styles (full SFF1 & SFF2 format support)
300 embedded rhythms, plus access to thousands of Yamaha style files
Better organization of song and rhythm files
Automatic notification of JJazzLab software updates
Various improvements and bug fixes

https://www.jjazzlab.com/en/download/