For desktop use from within Plasma/KDE I'm happy with Ktorrent. Feels very intuitive, and has no problem saturating a 1GB/s pipe, and doesn't slow the system down, while doing so.
(At least not mine, which are old and almost obsolete but have enough RAM)
Otherwise follow the links from there to qBitTorrent, or its mentions from other commenters here. Am not fond of transmission at all. Feels slow and sluggish in comparison.
(At least not mine, which are old and almost obsolete but have enough RAM)
https://en.wikipedia.org/wiki/KTorrent / https://apps.kde.org/ktorrent/
Otherwise follow the links from there to qBitTorrent, or its mentions from other commenters here. Am not fond of transmission at all. Feels slow and sluggish in comparison.