Various mandolin fretboard tools. There is a note finder, a chord finder and a tablature player for mandolin.
The mandolin note finder allows you to locate all occurences of the notes on the fretboard of a mandolin. Enter the notes in any chord, and you can begin to create your own chord shapes.
The mandolin tablature player can play most plain text ASCII tabs for mandolin.
I am aware that there is not that much tablature for mandolin available,
but the tool exists anyway.