Safari Books Online is a digital library providing on-demand subscription access to thousands of learning resources.
As you can imagine, the app space abounds with food-finding and analyzing tools. One of them is Locavore, a simple app for finding nearby farms and CSAs. It grabs your location and displays the fruits and veggies that are still in season there. It further gives you an option for finding a farm or CSA that carries the specified produce, showing all the places on a Google Map (with location information like addresses and websites). You can find that app at www.getlocavore.com.
All apps are limited by the databases they load, which may fall quickly out of date—or were never comprehensive to begin with. Apps cannot magically pick farms out of thin air like they can magically pinpoint your location (using your cell phone’s internal location software). I used Locavore in the parking lot of one of my local farms, and it did not locate or show the farm. It is free, however, so let’s not nit-pick.