I've been self-hosting Mealie. I have about 200 recipes there I think. I don't use it a ton, but it's super useful for looking up a recipe on the go. It's permissions/accounts system is super nice as well. I haven't heard of KitchenOwl so I don't know how well they stack up.
I also self host flash paper, a mumble server (voice chat), and linkding. Link ding is mainly for adding websites to a QR code that will take people to a random website.
I've been thinking of spinning up a paperless instance.
Firefox: tridactyl, jumpcutter, sidebery (best tree tabs I can find), temporary containers, cookie remover