For mostly linux and bsd specific
With gtk4 and libadwaita design
With qt5 and 6 under dev
https://www.tribler.org/ for all - https://github.com/Tribler/tribler
And why would anyone use this over qBittorrent? Genuinely asking. It's the gold standard and open-source too. Motrix also uses electron which is chromium-based and developed by GitHub. No thank you!