quick to install and set up FTP server on homebrew for OSX
As of writing, brew search ftp returns the following FTP servers:


pure-ftpd
vsftpd
proftpd


Based on their websites, pure-ftpd appears to be your best choice for easy installation.

pure-ftpd


  Beginners can install a Pure-FTPd server in 5 minutes. It can be as simple as installing the package, typing pure-ftpd &amp; and… that’s all. You already have a running server, and clients can start to connect.


So for the two step, install and set to start each boot commands:

brew install pure-ftpd
brew services start pure-ftpd


vsftpd


  vsftpd is a GPL licensed FTP server for UNIX systems, including Linux. It is secure and extremely fast. It is stable.


ProFTPD


  ProFTPD grew out of the desire to have a secure and configurable FTP server, and out of a significant admiration of the Apache web server.