Giorgio Pacchioni has maintained this library of downloadable (free) music for ocarina for many years now. It used to require a login but I believe it's public now. It includes many of his own compositions for ocarina and lots of classical and traditional music written for the ocarina.
Also note that much better quality scans of the ocarina septet partbooks are available from Emiliano Bernagozzi's website (see my other post for more information about that)