What do you do with deadfall?

I have a lot of fallen trees on my property. Obviously I salvage what I can for firewood, but most of it is half rotten and not suitable for either firewood nor building.

I clean it up into piles in the fall and spring and burn it in the winter. And I made a hugelkultur mound that used some of it. But there's sooo much, and I'd rather do something better than just burn it.

Any ideas?