LinuxMusicians

Looks like official Linux versions are released (the Multimeter is new) at klangfreund.com.

I've played with a native beta of their LUFS meter before, it's pretty handy the way it works across multiple tracks and can help set up an easy starting point for a mix (this is an old video, but it shows how it works).

Looks good, i will give the demo version a try.
I can't use the KXstudio LV2 version in Carla as I get bursts of noise when opening the plugin.