ZitaFTP Server allows you to quickly transfer files between computers securely. It's an FTP(S) server that's: - Fast - Secure - Supports multiple simultaneous connections - And more
It is a work-in-progress, but is already useful. So, all going well, a pre-release will be released by Hans at Kea Sigma Delta on Tuesday 20 August.
Just published a followup video giving some of the back-story ([url=https://keasigmadelta.com/blog/why-write-an-ftp-server-in-2019-zitaftp-servers-story/}click here[/url]).
NOTE: SFTP is actually a totally different protocol: file transfer over SSH. It's FTPS that you'll need for a secure FTP server. The location of that S makes a huge difference.