The 1.2 version of proftpd for OSX for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. This free Mac app was originally developed by Fork Networking. The application lies within System Tools, more precisely General.
From the developer:
proftpd is a popular FTP server application that allows you to setup multiple users, including anonymous, privatived FTP access.
You may want to check out more Mac applications, such as MPlayer OSX Extended, nrf-ble-sniffer-osx or QuickShow OSX, which might be related to proftpd for OSX.