Zabbix - Track, record, alert and visualize performance and availability of IT resources
ProtonVPN - ProtonVPN is a security focused FREE VPN service, developed by CERN and MIT scientists. Use the web anonymously, unblock websites & encrypt your connection.
pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more
OpenVPN - OpenVPN - The Open Source VPN
Cyberoam - Firewall
TunnelBear - Really simple VPN to browse the web privately & anonymously.