SolarWinds Permissions Analyzer is an investigative tool for managing Active Directory permissions. Specops Password Auditor scans all user accounts within your environment to detect leaked passwords. Wireshark has emerged as a popular replacement for Windows 2012+ Mac OS 10+ Windows Server 2012(R+mac 10+Windows) The tool supports an expansive list of operating systems: Windows Server 8+ and Mac 10+(R)’s Windows Server 6+Windows 10+Mac) It’s also a great supplement to Microsoft’s Azure AD Password Protection.
Source: https://thehackernews.com/2021/02/the-top-free-tools-for-sysadmins-in-2021.html