Already tried Movim :) https://movim.eu/ ?
It's a fully-featured web-based XMPP client. It integrates all the modern XMPP features (message editing, history management, file-sharing, video-conferencing, publications…), it's responsive and easy to use and deploy on a self-hosted instance.
Btw. I just saw that movin is advertising 'Conversations' (Android) and 'Dino' (Desktop) as alternative clients. While I use Conversations every day and can recommend it too, on the desktop side I would recommend Gajim instead.
Over the past years I used 'Pidgin' as my desktop client, but it was not were I wanted it to be so I was actively looking for alternatives. Dino looked very promising on paper (supported XEPs) but they lack basic stuff like systray support (at least the last time I checked it out).
For a long time Gajim wasn't any better than Pidgin, but earlier this year they released their version 1.0 which added support for some more XEPs most importantly MAM (enables proper history synchronization between clients). Since that release I switched to Gajim and stopped looking for alternatives ;-)
