Dale, Adobe Premiere has a great stabilizer tool called "Warp Stabilizer", and Premiere is available for both Mac & PC, but is a serious video editing profram. May be more than you want to bite off. There are other stabilization apps out there, but I'm not too familiar with them, since I have a decent one in Motion 4. Some are great, some are crap. Basically they can zoom your image in a bit, then read the horizon to try to counter shaky moves. You lose a bit of video resolution, but it's not too bad. You want something with the most options to adjust. You can't fix everything though. In my experience if you are flying at a low level, and the screen is filled with ground or trees moving by quickly, it has nothing to grab onto and can freak out. But more most things like flying along with a nice horizon in the shot, it can do wonders. They don't fix jello though. In fact, because your video will be shaking less, you can actually see the jello more clearly if it's there. There's no post fix for jello. Search "
Comparing video stabilization methods" or "best stabilization plug for aerial video"
and see what comes up. There should be a thread about that, and it would give some names to google further. Watch as much video about any stabilization you are thinking of as possible so you see if the results will apply to you.
Here's a free one:
https://www.youtube.com/watch?v=Li0MBkJG6k0 (I can't vouch for the quality)