It seems to be fresh and in an active development. It supports the most important standard extensions (XEP).
> Dino. Communicating happiness.
> Dino is a modern open-source chat client for the desktop. It focuses on providing a clean and reliable Jabber/XMPP experience while having your privacy in mind.
> [[ https://dino.im | https://dino.im ]]
> [[ https://github.com/dino/dino | https://github.com/dino/dino ]]