Whether you are using PC or Mac, if you are a guitarist, the application for you is GuitarShed. This little app is the best. Check out it’s features:

Chromatic Built-in tuner
Tuning - with different alternate tunings
Tuning for different instruments including Banjo
Keeps Tab for you with an autoscroll feature
Metronome with different sounds and timing
Song Jam - load you favorite song and jam along with it. Song too fast? No problem just slow down the song with the tempo adjuster.
http://rapidshare.com/files/13437816/Gu1tar_Shed_ncc.rar.html