I noticed this post on the NikonRumors Forum – a reader is developing an open source Nikon Camera Control software. Please note that this project is at its early stage and could have bugs or not be compatible with all Nikon DSLR cameras. The current features are:
- tethering
- remotely control camera basic properties
- remotely take picture
- manage multiple profiles
- raw support
- histogram & photo metadata view
- time lapse
Check also those free alternative third party solutions covered in previous blog posts: