Yes, LR if you have it (which I don't, btw).
A "free-for-all" is also available in the form of
FastStone Image Viewer (among others).
But if you take BOTH RAW+JPG as separate files, then you will still have to delete each one.
And so, why take both raw and jpeg? With this program (and others) you can see the embedded jpeg
in the raw file. You can then delete any non-keepers in one file.
Do you use Capture NX to develop your raw files, or Lightroom?
Note that although FastStone called an image viewer, this can also do a fair bit of editing of jpegs and other
formats.
If you also need free raw conversion programs there are a few out there.
- - - Updated - - -
Adjunct, after re-reading Boo's post: Faststone leaves your images in place in whatever folder they're located.
(I'm not sure what LR does in this regard.) Everything else, like tagging and other cataloggery is done by using
separate program files. (I don't use those features much anymore.)