The quality of applications available on Google's Android platform is improving by leaps and bounds. Whereas most of the apps that Google showcased last year in its first Android Developer Challenge were relatively simple location-based applications that relied upon Android's Google Maps program, this year's Android Developer Challenge showed off an enormous variety of complex applications that let users play guitar, learn about astronomy, get information on famous art or even chase down ghosts. In this slideshow we'll comb through some of the coolest apps from this year's Android Developer Challenge, whether they're games, reference apps or productivity tools.
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