Open source BT download tool qbittorrent multilingual 5.0.4​

Key Features:
µTorrent-like user interface (for seamless transitions).
Integrated and customizable search: on the most popular BitTorrent search site.
Supports all BitTorrent extensions: Magnet/BitComet, Peer Exchange, DHT, etc.
Advanced control over trackers, peers, and torrents (queues and priorities).
Supports UPnP/NAT-PMP port forwarding.
Bandwidth scheduler and sequential downloading.
IP filtering (compatible with eMule and PeerGuardian) and IPv6 compatibility.
Detailed torrent information: size, status, seeds, peers, download and upload speed, ratio, etc.