Making lye soap? I've used it for most of the purposes already mentioned but have yet to make lye soap from our ashes, though my grandmother used to do so.
The wild birds LOVE to eat the wood ashes also, as they are of some benefit for internal parasite removal and also hold valuable minerals for our own birds. My chickens love to pick through them.
I usually keep a charred log in animal pens for sampling and have seen them sample. My grandma used to do so with her pigs as well.
Control pond algae, shine tarnished silver, etc.
Here's a pretty extensive list of 60+ uses for it:
https://practicalselfreliance.com/wood-ash-uses/
After reading some of this article I realized we've used ashes in the outhouse before too, just needed to read it to remember that.