I`ve been using a software tuner, developed by Tatsuaki Kuroda, for several years. It has a tuning meter with "needle", shows the frequency spectrum, e.g., amplitude and pitch of a note`s fundamental and harmonics. It even shows the fingering of the note being played (auto mode), and you can manually step thru the notes to see the fingering for a note (good for beginners).

I started playing oboe a couple of months ago. The tuner had fingerings for flutes, saxes, recorder, clarinet, ocarina, etc., but no oboe. I asked Tatsuaki Kuroda san if he could add one. He graciously agreed to add an oboe, and it`s now ready in version 2.52.

The URL for reading about, and downloading (free) the tuner is given below. There`s also a metronome, and tuning fork.

http://www1.ocn.ne.jp/~tuner/tuner_e.html