Steve's client works under Linux with WINE.
That's nice, but not enough. WINE has security issues. I would preferentially desire to avoid installing WINE on my Linux systems.
The situation right now seems to be that no one is interested in developing a FULL Linux implementation of SQRL. I would love to take on a project like this, but I am sure that this is not a one person job, nor should it be. I also think I do NOT have the necessary skills to to this effectively.
If anyone does decide to take this on, I would be willing to help.
Of course, until adoption of SQRL becomes more widespread, it might be a mute point.
I can always use the Android Client - which is nice, although still lacking one critical feature (in my opinion) - using alternate IDs.
(yes I know not everyone here thinks this is a critical feature).