Free Sheet Music
A gigantic repository of scanned public-domain scores for Classical music up to the
early 20th-Century. Conforms to Canadian copyright laws which are in some instances a little more permissive than
the U.S.
John Mamoun scanned a bunch of public-domain editions of piano music, and he offers them here in PDF form.
A collection of used-submitted scores, many of them in newly created editions (as opposed to scans of
19th-century ones.) An announcement on the site in Aug 2011 says that it will merge with IMSLP.
Specializes in choral music.
An open source music project for scores and recordings.
These scores are all set using lilypond.