ProFTPD

ProFTPD是一个Unix平台上或是类Unix平台上(如Linux, FreeBSD等)的FTP服务器程序，它是在自由软件基金会的版权声明(GPL)下开发、发布的免费软件，也就是说任何人只要遵守GPL版权声明，都可以随意修改源始码。

The ProFTPD Project team is happy to release 1.3.3e to the community. This is a maintenance release, containing backported fixes for bugs found in the 1.3.3 release. The RELEASE_NOTES and NEWS files contain the full details.