SurgeFTP is a Servers & Network software developed by NetWin Ltd. After our trial and test, the software is proved to be official, secure and free. Here is the official description for SurgeFTP:

Marydown Editor: SurgeFTP Server - An FTP server which gives you top performance, reliability, reporting tools and most importantly ease of management. And full SSL/TLS security means your users passwords and data are no longer flying all over the internet for everyone to see!