The qBittorrent project aims to provide an open-source software alternative to µTorrent.

Additionally, qBittorrent runs and provides the same features on all major platforms (FreeBSD, Linux, macOS, OS/2, Windows).

qBittorrent Features

Polished µTorrent-like User Interface
No Ads
Well-integrated and extensible Search Engine
Simultaneous search in many Torrent search sites
Category-specific search requests (e.g. Books, Music, Software)
RSS feed support with advanced download filters (incl. regex)
Many Bittorrent extensions supported:
Magnet links
Distributed hash table (DHT), peer exchange protocol (PEX), local peer discovery (LSD)
Private torrents
Encrypted connections
and many more…
Remote control through Web user interface, written with AJAX
Nearly identical to the regular GUI
Sequential downloading (Download in order)
Advanced control over torrents, trackers and peers
Torrents queueing and prioritizing
Torrent content selection and prioritizing
Bandwidth scheduler
Torrent creation tool
IP Filtering (eMule & PeerGuardian format compatible)
IPv6 compliant
UPnP / NAT-PMP port forwarding support
Available on all platforms: Windows, Linux, macOS, FreeBSD, OS/2
Available in ~70 languages

v5.2.1 changelog:

BUGFIX: Fix building with latest zlib (glassez) #24200
BUGFIX: Remove old-format lockfile when starting (glassez) #24218
BUGFIX: Prevent SSRF via HTTP redirection (AlexandrBlishun) #24270
BUGFIX: Delete stale lockfile when machine-id mismatch (glassez) #24285
BUGFIX: Fix handling of ‘Accept-Encoding’ header (glassez) #24286
WEBUI: Avoid search downloader for magnet links (TurboTheTurtle) #24211
WEBUI: Work around browser extension interfering with Add Torrent Dialog (vafada) #24240
WEBUI: Filter all children of content root (vafada) #24243
WEBAPI: Don’t store API result between calls (beryxz) #24262
RSS: Fix refresh is indefinitely called when there are no feeds (glassez) #24199
SEARCH: Avoid proxy interfering with multiprocessing pool (Chocobo1) #24234

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