For years, I've used a lot of different knives for skiving. In the following photo, mostly the round knife and the one to the right of it have been pretty good for the purpose but I've not been completely satisfied.
Today I made one out of a circular saw blade (the left over piece of the same blade I used to make the round knife). I shaped it with a peanut grinder and roughed in the edge with my 90 RPM water bath knife grinder. It throws water all over the place but it works great. At first I made it with a straight cutting edge but it was not completely satisfactory so I put a curve to the edge and it works much better. It's only ground from one side so I can get down low with it if needed. I'll try it for a while and if it works as good as I expect, I'll fashion some kind of handle on it. The hardest thing is going to be protecting the edge when it's in the toolbox. Maybe I can find something to cover just the cutting edge or something.
I see Osborne has a couple different knives that would work but I didn't want to wait for one to arrive and this scrap of saw blade has been getting in the way for a few years. It was a good excuse to get a knife and get rid of an eyesore hanging from a beam in the garage.
What do all of you use for skiving?