qBittorrent
qBittorrent is a free, cross-platform BitTorrent client with a feature-rich Web UI for remote access. It is for people who want to use BitTorrent across platforms and for users who need to reach the client remotely through a web interface. Because it is free, users can use the client and Web UI without paying for the program. qBittorrent's main limitation is its narrow protocol role: it is built around BitTorrent, not every kind of file transfer. Users who need a client for protocols other than BitTorrent may need separate software. Its Web UI adds a remote route to the client without changing the protocol at the center of the program. The cross-platform design broadens where the client can be used, but it does not broaden the client beyond its BitTorrent focus.