DC++ - DC++ developed by Jacek Sieka.
qBittorrent - Lightweight and open source torrent client that runs on all major platforms.
EiskaltDC++ - EiskaltDC++ is a program for UNIX-like systems that uses the Direct Connect and ADC protocol.
Deluge - Deluge is a full-featured BitTorrent client for Linux, Unix and Windows.
LinuxDC++ - LinuxDC++ is a port of https://alternativeto.net/software/dc/ direct connect client to Linux.
BitTorrent - BitTorrent is a peer-to-peer program developed by Bram Cohen and BitTorrent, Inc.