Today’s freebie resource is this set of helpful links for students learning the violin, cello and viola, submitted by Freebie Hunter, Laurie B. (thanks, Laurie!):
My daughter has used this website at various stages of learning to read treble clef on her violin through the years. Now, she recommends this website to her students when they are ready to begin reading notes. This website allows you to choose any key signature and locate that note on the
fingerboard of the violin on the screen.
This one for the cello is not quite as good as the violin site, but it will allow you to print flashcards for the bass clef.
This is the same version as the cello, but these will allow practice for the viola in the alto clef.