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Very cool! If you're a guitar player, you might like: http://public.vexflow.com/vextab/

Could that be modifed to produce banjo tabs (five lines, perhaps with fingerpicking notation)?

As someone who has tried making a sheet music renderer, VexFlow is extremely impressive.

Yeah, I got as far as rendering the tab and the notes - but then trying to tie the “tied” notes together... that’ll drive you crazy.