These are free or available for a small fee apps for hand held devices.

Compass   

Displays a compass to assist with finding north.

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ISS Spotter  

Find the International Space Station

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ISS Detector Free 

Android Platform app for finding the International Space Station

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JupiterMoons

Sky and Telescope app showing the position of the four Galilean satellites and Great Red Spot Transits.

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Mars Globe                           

Shows the named features on the surface of Mars.

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Meteor Shower Calendar

Gives dates for various meteor showers.

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Moon    

Moon phase with rising and setting times.

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Moon Globe                           

Shows named features on the surface of the Moon.

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Planets  

Shows the night sky with constellations marked and locations of the planets, Sun and Moon.

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SatelliteSafari                      

Shows positions of satellites on a constellation background.

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SaturnMoons                        

Sky and Telescope app showing the positions of Saturn moons.

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Sky Week                               

Sky and Telescope’s Daily Update.

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SkySafari 

Complete planetarium program. Advanced versions will allow you to store observing lists and control your GOTO Telescope.

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Stellarium                             

Complete planetarium program.