Guitar-Online Tuner 

This guitar tuner allows standard and open tunings. The program shows the name of the note, together with its place on the stave, and numerical values of pitch/frequency. If the open tunings doesn't fit your needs, you can use the keyboard too.
tuner tuning open tuning guitar diapason pitch tuning fork pitch pipe tune

Sight Reading Challenge 

Learn the 21 notes of the Bass Clef and Treble Clef. The program displays the notes on the staff, and you press the name of the letter. If you get it wrong, the program displays the name above the staff. You then press the correct name to proceed.
treble clef bass clef music staff note sight reading ear training music flashcards