Ladspa, Lmms, Audacity, Vst/Vsti, and Soundfonts (sf2). A large supply of loosely licensed tools for practitioners of the craft.

If you are into chiptunes then something like Milkytracker is probably more to your liking.

I wrote the following to get familiar with the tools. With more focus and dedication I would have recorded more and digitally composed less. But even though it isn't great, I had fun with it.

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