TriKaraoke MP3+G Player (Free)
Full user review
"What do you want for free?"
It has some cool features and doesn't take up much room.
Running the lyrics screen full-screen won't pop it back into the main monitor, like some.
Built-in pitch change.
Multiplex capability built in.
Database is vague (no performer/title/disk designations)
Limit of 30k songs