KTorrent
KTorrent is the most leading BitTorrent application by KDE that enables you to download any kind of files using the BitTorrent protocol. It allows you to run several torrents simultaneously and comes with extended features to make it a feature-rich client for BitTorrent. As compared to all the other BitTorrent applications, it works similarly but offers a new interface with dozens of new features that make it better than others.
KTorrent’s most prominent feature includes global and per-torrent speed limits, previewing certain file types, importing partially or fully downloaded files, and selective downloading for multi-file torrents UDP tracker support, and much more. In addition to built-in functionality, KTorrent also has some plugins that make it better than others.
#1 Deluge
Deluge is the most leading BitTorrent client for Windows, OS X, Linux, and Unix operating systems. It is a feature-rich solution and uses libtorrent in its backend and offers multiple user-interfaces, including web and console. This BitTorrent client is specially designed using a client-server model with the daemon process that handles all the major BitTorrent activities.
Deluge aims to be a secure and lightweight client, and most of its features are part of plugin tools that were written by various developers. The client is capable of running on headless machines with the user-interfaces being able to connect remotely from any platform at all times.
Its other prominent feature includes rich plugin collection, simple, fast, and secure, operates in GNOME, XFCE, KDE, and lots of other similar platforms, etc. Deluge is a 100% free software and is licensed under the GNU General Public License.