I found this the other day. It's Linux first, but not FOSS. Flatpak version is pretty sweet. https://indomitusgroup.com/indipdf/
I recommend portknox.net. One of the Nextcloud team suggested them to me, and they are pretty awesome.
I found this the other day. It's Linux first, but not FOSS. Flatpak version is pretty sweet. https://indomitusgroup.com/indipdf/