Slideshow » 15 amazing Web apps built in 48 hours

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15 amazing Web apps built in 48 hours By Julie Bort

Winning entries from the annual Ruby on Rails coding contest.

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Photo 4 out of 15

Third prize: Riverdex
Rafters and kayakers rejoice. This site pulls live, streaming data from the US Geological Survey's flow gauges on thousands of rivers nationwide, so boaters can easily pinpoint the best river to run.

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