Breaking news! JoyTunes just announced they are now offering the app Piano Maestro at no cost for teachers and students. This exciting app works with your acoustic piano to help students learn more quickly and become better students. Check out their blog announcement here.
Just discovered (new to me) some free piano arrangements by a guy I went to school with. Check it out; he's a talented arranger. He has arranged both piano and choral. http://koertsmusic.com/piano-music/
Oh, and hoping you are having a blessed Christmas season!