Rain Harvest
Available for: iPhone, iPad, iPod Touch
Price: Free

If you lived in one of the drier parts of the country during last year's record drought, you don't need much of a reminder of how precious a resource a little rain can be. If you're seriously considering making the most of whatever rain you get during this year's warm season, this free app can tell you just how much rain falls on your roof during a typical storm and how much of it can find its way into cisterns, rain barrels and other vessels that can be used to water your garden later on. Just calculate the number of catch points and start saving up that water for a not-so-rainy day.

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