Converse.js
XMPP chat client in your browser.
Self-hosted Communication - XMPP - Web Clients software
Extensible Messaging and Presence Protocol Web clients/interfaces.
3 apps, ranked by GitHub stars weighted by maintenance health.
Libervia
Web frontend from Salut à Toi.
Salut à Toi
Multipurpose, multi frontend, libre and decentralized communication tool.