是跨平台的 BitTorrent 下载客户端程序，在运行时需要 Java 运行环境的支持。Azureus 的更新版 2.5.0.2 在今日发布了。新的版本不仅添加了一些新的特性，而且也作出了不少改善。另外，许多的 bug 也得到了修复。
以下援引的是 Azureus 官方发布的更新列表：
New features:
· Core: Added method to XFS specific allocation of new files
· Core: Added per-torrent max seeds parameter
· Core: Added per-torrent max peers parameter
· UI: Total file size added to Open Torrent Window
· UI: Option to show complete downloads with incomplete “do not download” files in the download area
· UI: Added custom user comment field
· UI: Added file extension column in files view
· UI: Spinners for config field that take numbers
· UI: Setting for Minimum # of Simultaneous Active Downloads to have running at any given time
· UI: Console UI NAT test
· UI: Option to have separate rename and retarget menu items in Files view
· Plug: Plugins can now create submenus.
· Plug: Added code to allow plugins to get text input from a user in non-UI specific way.
· Plug: Plugins now have better support to organise file data within default save directories.
· Plug: Plugins can now easily add hyperlinks to config sections.Changes:
· Core: Improve the “presence” handling for torrents created by ourselves
· Core: Less memory footprint
· Core: Faster startup for large torrent lists (and no naughty plugins)
· Core: NAT test moved to separate server
· Core: Download up/down idle counts now persisted over restart
· UI: Open torrent windows now always has OK button enabled with warning message if pressed when in invalid state
· UI: Remove nag/donation window
· UI: Differentiate between libTorrent (Rakshasa) and libtorrent (Rasterbar)
· UI: For multi-file torrents, icon in name column displays icon for largest file (+ a little folder icon)
· UI: Faster filtering when torrent list is large
· UI: Better logic when preventing a user deselecting files to download from Open Torrent windowBugs fixed:
· Core: If clipboard has just a ” or “” in it the open-torrents dialog won’t open
· Core: Setting of UDP port not working
· Core: Less flipping of downloads from queued <--> downloading during the time a FP seed is forced active
· Core: Fix memory leak causing slow, but eventual OOM and slow down of Azureus
· Core: OSX: Handle volume not mounted on startup by erroring instead of creating a directory in /Volumes
· Core: Fix to stop already complete downloads being moved by “move-on-completion” rules
· UI: Fix (some) painting issues in pieces+files view
· UI: Fix to allow negative values for Multi-monitor window positions
· UI: Fixed memory leak in “Mr Slidey” code
· UI: Fix UI loss when clicking delete from icon bar while in Details view
· Plug: Fixed bug where some listeners for table columns were not registered properly.
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