FileZilla Server - Download FileZilla Server 0.9.60.2 for Windows
Zabbix - Track, record, alert and visualize performance and availability of IT resources
vsftpd - Very secure FTP Daemon, a secure, fast FTP server for UNIX systems, including Linux.
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
Baby FTP Server - The simplest FTP server to setup. No authentication required.
Prometheus - An open-source systems monitoring and alerting toolkit.