On my Surface RT, my photo tools are fotor (or Fhotoroom) for basic editing, which is crop and alignment, SwitchTo:Resize to re-size, WaterMark to put watermarks.
On my Windows 8 (Acer S3), I use Capture NX 2.
On both devices, the Photos app can display NEF files, the File Picker shows NEF files, and of course the File Manager (Desktop) can show NEF files.