Chord Alchemy 

ChordAlchemy is the ultimate tool for chord lookups, reverse chord lookups and hearing how they sound. ChordAlchemy supports 100+ tunings, Added Bass, No Root, Scales, Chord Pages and Printing. Superb user interface for easy chord generation control!
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MusicGoals by Eye and Ear 

ear training, sight reading, and music theory applied to piano, guitar, violin, viola, cello, and bass - MusicGoals offers study, practice, and testing to improve skills, gain knowledge of instruments and music theory, and train the musical ear.
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MusicGoals Demo 

ear training, sight reading, and music theory applied to piano, guitar, violin, viola, cello, and bass - MusicGoals offers study, practice, and testing to improve skills, gain knowledge of instruments and music theory, and train the musical ear.
music theory software ear training sight reading advanced placement improve skills chords scales intervals piano guitar keyboard violin viola cello