Gossip is a native desktop-only client.

Check it: https://github.com/mikedilger/gossip

Prebuils releases a bit outdated (2/3 weeks ago) and the development is quite active, so the best option is to compile it from source (quite easy on a *nix OSes, using cargo).

Iris is great but I don't like very much the not-nested thread visualization; it can be a necessity on mobile but on desktop there is plenty of space to have a more structured navigation style, like Gossip is trying to achieve.