Nootka is open-source application
to help with learning (also with teaching) classical score notation.
Mostly it is for guitarists,
but it can be used for ear training as well.

Features:

interactive interface to discover the rules of musical notation
exercises with possibility to create own sets
accurate method for detecting sung and played sounds
natural sound of guitars
clefs (treble, bass and others) and grand staff
analyse of results
different kinds of guitars and theirs tuning
Czech, French, German, Polish and Russian translations