johnfactotum

Currently there's no tabs support. But it does support multiple windows.

Evince doesn't support EPUB, and the request for support has been marked as WONTFIX (see https://bugzilla.gnome.org/show_bug.cgi?id=539347).

However, Atril, which was originally forked from Evince, does support EPUB rather well.

Two-page view in Bookworm is problematic. See https://github.com/babluboy/bookworm/issues/199

You can build your own Flatpaks from source, too. In fact that's probably how a lot of development is done these days around GNOME and its wider community when using Gnome Builder. You make a change, and Gnome Builder builds a Flatpak and runs it for you so you can test it.

Hi, author of Foliate here. It sounds like you're using something like Ubuntu 16.04 or similar? Foliate currently requires GJS >= 1.52 and Meson >= 0.40.

There's an open issue here on supporting older systems: https://github.com/johnfactotum/foliate/issues/45