Nextcloud + Matrix (Riot Client) Integration
Just found this a bit interesting. For those that don't want to run multiple apps for this, Nextcloud has a community app that packages the Riot Client (and admin can configure it and such).
So if you are running both Nextcloud AND Matrix, this may (or may not depending on what you want) be a simpler solution than Cloudron's packaged Riot as you do not need to allocate more resources to another app.
I am not saying this is a better solution, just something different that I thought was pretty cool.