Vuze (formerly Azureus) implements the BitTorrent protocol using java language and comes bundled with many invaluable features for both beginners and advanced users.

Features:

• Multiple torrent downloads.
• Upload and download speed limiting, both globally and per torrent.
• Advanced seeding rules.
• Adjustable disk cache.
• Only uses one port for all the torrents.
• UPnP sets the forward on your router.
• Can use a proxy, for both tracker and peer communications.
• Fast resume.
• Can set a default download dir and move completed files.
• Can import torrents automatically from a set directory.
• Highly customizable interface.
• IRC plugin included for quick help.
• Embedded tracker, host your own torrents, automate your shares (periodic scanning of a dir)...
• Distributed Hash Table: host on it a completely decentralised torrent and/or benefit from it when the tracker is offline.

Many useful plugins are available

• Auto-adjustment of your upload and download speeds according to your network charge with Autospeed.
• Auto-download torrents with RSS Feed Scanner.
• Schedule upload and download speed limits with Speed Scheduler.
• Receive a mail when a download finishes with Status Mailer.
• Add numerous info on torrents (Extra seeding columns, Country Locator)
• Remote control Vuze through the Swing Web Interface or the HTML Web Interface.