A lot of them seem to be "free" with an optional subscription.
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I haven't used them but these are on the izzysoft F-Droid repo:
- https://apt.izzysoft.de/fdroid/index/apk/com.littletrickster.scanner
- https://apt.izzysoft.de/fdroid/index/apk/com.bretahajek.docus
- https://apt.izzysoft.de/fdroid/index/apk/com.ethereal.openscan
You may try this: https://github.com/Akylas/com.akylas.documentscanner
I currently use Notebloc. It's not opesource and has ads. But it's decent.
