If you're on Windows, check out
MuseScore 2 (free, open source). I use it for importing ABC or Midi files into a sheet music score, when I want to edit a fiddle tune to correspond to a local version, or in a few cases to transcribe something from scratch. There is an experimental PDF import that kinda works, but may need some hand-edits.
I use it only in standard notation mode. It has a tablature function, but I haven't used it so I don't know how well it works. Maybe someone else here can comment on that.
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