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Chord.rb initially targeted Ukulele chords and was modeled after the Tab::Ukulele Perl module. I rewrote it in Ruby and RMagick (an interface to ImageMagick) and am now reworking it to be instrument-agnostic.
TabsOnRails is a simple Rails plugin for creating and managing Tabs. It provides helpers for creating tabs, an navigation menu in general, with a flexible interface.