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A quick Google search led me to a tool in GIMP called the "Resynthesizer Tool," which is apparently GIMP's version of Photoshop's Content-Aware Fill. Here's a video tutorial on using the Resynthesizer Tool. Hope that helps. https://www.youtube.com/watch?v=aEV0X5WNRVY
I've used digiCamControl a couple of times with my D7100 (although I haven't tried the newest versions). It's free and open source, and works quite well, except for a few quirks here and there.
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