J.S. Bach: 6 Sonatas & Partitas for solo violin / transcribed for viola / transcribed for cello
J.S. Bach: 6 Suites for solo cello / transcribed for viola / transcribed for violin
Free sheet music resource for strings: violin, viola, cello, double bass, string quartets, string trios, duets and solo sonatas with continuo, solo unaccompanied works, christmas carols. All free to download/access as pdfs posted on the net.