Powerful FTP server with simultaneous connections for your Mac. 
Rumpus is a powerful FTP server for Mac based on the TCP / IP implementation of Maxum RushHour, Rumpus offers total flexibility and efficiency when sharing files over the Internet.

In addition to support for long filenames and the ability to customize the permissions and file uploads, provides up to 32 simultaneous connections and 32 different users, not to mention the extremely simple configuration system with which you can create new users and determine the permissions.