For your camera try Digicamcontrol link
http://digicamcontrol.com/ its what i use to control my nikon d3200.
My camera doesnt have bulb mode support however i can take up to 30 seconds shots and also live view with this software. Its free also. Not sure what other support for your nikon but for me to do long exposures this software allows me to put into bulbmode then i use an intervalometer to take however long a shot i want. And it dumps directly to the digicamcontrol software. Hope this helps.
Another software i use and relatively cheap is alignmaster.
http://www.alignmaster.de/ aligning is actually really easy using this software as well.
Ben