Matt, You might want to try TuxGuitar. It's free, it's good, it handles triplets nicely, and it imports and exports to other file types including GuitarPro, MusicXML, LilyPond and TablEdit (input only). I think TablEdit will import at least some of those. TuxGuitar printed output isn't the greatest but its ability to export LilyPond and MusicXML means it's easy to use other tools for printing. But the TuxGuitar user interface is very nice.

      - Mark