A simple torrent client.
Fragments
Fragments is an easy to use BitTorrent client for the GNOME desktop environment. It is usable for receiving files using the BitTorrent protocol, which enables you to transmit huge files, like videos or installation images for Linux distributions.
Motrix
A full-featured download manager
qBittorrent
The qBittorrent project aims to provide an open-source software alternative to µTorrent.
KTorrent
KTorrent is a BitTorrent application by KDE which allows you to download files using the BitTorrent protocol.
Ant Downloader
A lightweight, feature-rich, easy-to-use and nice-looking BitTorrent Client developed by golang, angular 7, and electron.
Rats Search
BitTorrent P2P multi-platform search engine for Desktop and Web servers with integrated torrent client.
aMule
aMule is an eMule-like client for the eD2k and Kademlia networks, supporting multiple platforms.
Currently aMule (officially) supports a wide variety of platforms and operating systems, being compatible with more than 60 different hardware+OS configurations.
aMule is entirely free, its sourcecode released under the GPL just like eMule, and includes no adware or spyware as is often found in proprietary P2P applications.
BiglyBT
BiglyBT is a feature filled, open source, ad-free, bittorrent client.
Popcorn Time
Popcorn Time streams free movies and TV shows from torrents.