Zabbix - Track, record, alert and visualize performance and availability of IT resources
FileZilla Server - Download FileZilla Server 0.9.60.2 for Windows
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.
vsftpd - Very secure FTP Daemon, a secure, fast FTP server for UNIX systems, including Linux.
Wireshark - Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.
Baby FTP Server - The simplest FTP server to setup. No authentication required.