Deluge is a fully-featured cross-platform BitTorrent client. It is Free Software, licensed under the GNU GPLv3+ and adheres to freedesktop standards enabling it to work across many desktop environments.
GTK — gnutella
gtk-gnutella is a server/client for the Gnutella peer-to-peer network.
Tixati
Tixati is a New and Powerful P2P System
uTox
µTox the lightest and fluffiest Tox client
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.
Sengi
A FLOSS multi-account Mastodon and Pleroma desktop client
urdimbre
Share files across the LAN
Ant Downloader
A lightweight, feature-rich, easy-to-use and nice-looking BitTorrent Client developed by golang, angular 7, and electron.
Nthoni ratas
BitTorrent P2P multi-platform search engine for Desktop and Web servers with integrated torrent client.