Sysmon prints short and uniform information about OS
Open Source Monitoring System for performance and availability.
Free UTM appliance: firewall, VPN, WAF and antivirus in one ISO.
TraceMAC is a command-line Layer 2 traceroute for Cisco switches
Anti Spam SMTP Gateway
The Free & Popular opendhcp application for Physical & Virtual Machine
OpenVPN server in a Docker container complete with an EasyRSA PKI CA