BiglyBT: Open source torrent app with plugins, decentralized ratings/comments, and "swarm search" that crawls the DHT to find torrents without a tracker/search site
Feature-filled Bittorrent client based on the Azureus open source project - GitHub - BiglySoftware/BiglyBT: Feature-filled Bittorrent client based on the Azureus open source project
I just tried it. Custom UI with wonky text, doesn't support system dark mode, started up taking over my whole ultra-wide screen in a flood of white. Immediately removed this.
Java apps can be made well though but this isn't one of them.
Compared to the memory footprint of web browsers, a Java BT app is pretty tame on modern computers these days. Nor do you have to faff around with installing JRE manually. It just works.
Resource usage is pretty good tho and it can handle hundreds of torrents with ease.