Windows (10/Servers)
Visit https://techcommunity.microsoft.com/t5/microsoft-security-baselines/security-baseline-final-windows-10-and-windows-server-version/ba-p/1543631 for Security baseline (FINAL). #Win-GPO
Visit https://www.microsoft.com/en-us/download/details.aspx?id=55319 for Microsoft Security Compliance Toolkit. #Win-GPO
Visit https://www.cisecurity.org/benchmark/microsoft_windows_desktop/ for CIS Microsoft Windows Desktop Benchmarks. #Win-CIS
Ubuntu
Visit https://github.com/konstruktoid/hardening for Ubuntu automated hardening tool. #Ubuntu-Auto
VMWare
Visit https://github.com/vmware/dod-compliance-and-automation for VCenter, VSphere, ESXi, and VMWare hardening tool. #VMWare-Auto
OpenVPN
Visit https://blog.securityevaluators.com/hardening-openvpn-in-2020-1672c3c4135a for OpenVPN hardening. #OpenVPN