I'm not a Nikon user
Neither am I
but here is another link specifically related to Nikon and free software I think.
http://thephotogeek.com/choosing-nikon-dslr-camera-tethered-shooting-software/I searched on "tethered dslr shooting".
have just purchased a nikon d5000 and was wondering if there was any software that will enable me to operate the camera from the laptop. have previously used a canon eos 1000 and that came with the software.
The alternative is to take the Nikon back and get a Canon again
Just joking.
I know someone at the photo club who does wireless tethered shooting for events, with a Nikon, but unfortunately, I'll not be seeing him for a while.
Terry.