DivestOS is the only Android ROM I know of that integrates the Mulch webview. But Tad (DivestOS dev) also builds standalone binaries of Mulch that can be installed independently- just add their repo into f-droid or something like droidify and you’re good to go. Link: https://divestos.org/fdroid/official
Synology’s Download Station introduced me to emule. I don’t think there’s a more polished client for it than DS.