For web clients primal.net snort.social coracle.social If you'r looking for a desktop client I think Gossip is the only linux one, but I could be wrong.
Discussion
I have snort set up on the browser and gossip on the desktop, but both lack compared to Amethyst. Gossip in particular is clunky , have to manually readd follows andfollowers, gonna try primal and see how it is
i really haven't found anything as good as Amethyst on any other platform so far.