QTBT

QTBT, short for Qt BitTorrent, is the historical name for the open-source BitTorrent client that is now widely known as qBittorrent. The name reflects its design around the Qt application framework and the BitTorrent protocol. QTBT originated as a free, cross-platform alternative to proprietary BitTorrent clients and has since evolved into the main qBittorrent project used by many users on desktop and server environments.

The project is community-driven and primarily developed in C++ with a graphical user interface built on Qt. It relies on the libtorrent library for the underlying BitTorrent protocol implementation. QTBT/qBittorrent is distributed under the GNU General Public License (GPL) v2 or later, and its source code is publicly available through repositories maintained by volunteers and contributors around the world.

Key features commonly associated with qBittorrent include cross-platform support (Windows, macOS, and Linux), a built-in search capability via plugins, support for RSS subscriptions, torrent creation, and sequential downloading. It also provides bandwidth scheduling, IP filtering, protocol encryption, UPnP/NAT-PMP port mapping, proxy support, and a Web UI for remote control. The client emphasizes a clean, straightforward user interface while offering a broad set of advanced options for power users.

As an active open-source project, QTBT/qBittorrent continues to receive regular updates and improvements from its community. It is regarded as a prominent, lightweight alternative in the BitTorrent ecosystem, balancing usability with a comprehensive feature set.