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Azureus implements the BitTorrent protocol using java language and comes bundled with many invaluable features for both beginners and advanced users: * 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 dir * 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.