Clamor is an ear training software designed to improve musical ability.
As of the time of this review, the software is compatible with Linux and FreeBSD systems. It's written to be platform-independent, so it might be possible to port to other systems, although the developer hasn't tried.
Clamor is still in its early pre-release phase, so expect some hitches and glitches along the way. Before getting started with the software, make sure to install "sox", "Audio::Data", "Audio::Play" and "Clone" Perl modules.
If you use FreeBSD, it should be smooth sailing, with the necessary ports - "audio/p5-Audio" and "devel/p5-Clone" - readily available. Things aren't so easy on Debian, though, as the Audio module isn't available through Debian's package system. While you could try getting it directly from CPAN, there have been reports of crashes.
Version 0.0.24: N/A