Veyon - Veyon, Virtual Eye On Networks, is a free and Open Source software (FLOSS) for computer monitoring...
ProtonVPN - ProtonVPN is a security focused FREE VPN service, developed by CERN and MIT scientists. Use the web anonymously, unblock websites & encrypt your connection.
Epoptes - Epoptes is an open source computer lab management and monitoring tool.
OpenVPN - OpenVPN - The Open Source VPN
Mythware Classroom Management Software - Mythware Classroom Management Software for Windows, Mac, iOS, Android & Linux allows for complete monitoring, control and collaboration with students.
TunnelBear - Really simple VPN to browse the web privately & anonymously.