DrFTPD 是一个纯java的分布式FTP服务器。DrFTPD由一个master节点和多个 slave 节点组成，其中 slave 节点用来真正的接收文件传输任务，而 master 用来管理 slave 节点做负载均衡。结构如下图所示：

Features

• Free Software
• Uses file transfer slaves as explained above
• Runs without root/administrator privileges
• Stripes files across slaves
• Slave selection based many different conditions including bandwidth, free space and sections
• In-memory filelist with cached checksums
• Many plugins built-in
  • Zipscript
  • IRC Sitebot, or multiple
  • User Trial
  • Archiving/mirroring plugin
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• Slave stripes files across multiple roots (mountpoints)
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项目主页：http://www.open-open.com/lib/view/home/1357872353067