Riot is a glossy Matrix client built on top of matrix-react-sdk with an emphasis on performance and usability.
You can use it at https://riot.im/app, read more at https://riot.im and get the source from github!
There is also a desktop version, which is available at riot.im. Taw has created RPM package builds for Fedora, CentOS, and Red Hat Enterprise Linux which are available via GitHub and FedoraCorp.
Josué Tille has contributed a Yunohost app.