Vuze (formerly Azureus) is a free BitTorrent client used to transfer files via the BitTorrent protocol. Vuze is written in Java, and uses the Azureus Engine. In addition to bittorrenting, Vuze allows users to view, publish and share original DVD and HD quality video content. Content is presented through channels and categories containing TV shows, music videos, movies, video games and others. Additionally, if users prefer to publish their original content, they may monetize it.

Vuze was first released as Azureus in June 2003 at SourceForge.net, mostly to experiment with the Standard Widget Toolkit from Eclipse. It is now a highly popular BitTorrent client. The Azureus engine is released under the GNU General Public License, and is free software. However, parts of the recently added Vuze platform carry more restricted licensing terms, and it is no longer possible to install the Azureus engine using the latest installer without first accepting the Vuze license.