SatTrack, (aka Heavens Above), tracks several hundred sats & pushes notifications based on user preference, magnitude, altitude, TOD, etc. Free on android market, (indiscreet ad support or donation supported, well worth a buck or two, imho), believe also available for apple, but not positive. Small footprint w/configurable widget & audio notification if desired. I have used this for 5yr & luv it!
