Riot is a universal chat client powered by Matrix, an open protocol that makes it easy to chat with friends, team members, co-workers, etc. It comes features that users would expect out of proprietary solutions like Slack and is a good alternative if you would prefer an open solution for IM communication on Linux and other platforms.
See how at https://www.addictivetips.com/ubuntu-linux-tips/how-to-install-riot-on-linux/
#FOSS How to install Riot on Linux
How to install Riot on Linux