KOReader is built for kobo e-ink readers but will run on Android and Linux distributions. It supports syncing to Calibre which you could self-host and access ov

KOReader is built for kobo e-ink readers but will run on Android and Linux distributions. It supports syncing to Calibre which you could self-host and access over tailscale. As for webapps, you have einkbro on android, which you could run on linux with Waydroid.