 It uses Boost, Qt toolkit (version 4 or 5), and libtorrent-rasterbar library (for the torrent back-end).Its optional search engine is written in Python.qBittorrent was originally developed in March 2006 by Christophe Dumez, from the Université de technologie de Belfort-Montbéliard (University of Technology of Belfort-Montbeliard) in France.