diff --git a/README.md b/README.md
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+++ b/README.md
@@ -418,6 +418,7 @@ See also [awesome-windows#security](https://github.com/Awesome-Windows/Awesome#s
 
 - [HardenTools](https://github.com/securitywithoutborders/hardentools) - Utility that disables a number of risky Windows features.
 - [NotRuler](https://github.com/sensepost/notruler) - Detect both client-side rules and VBScript enabled forms used by the [Ruler](https://github.com/sensepost/ruler) attack tool when attempting to compromise a Microsoft Exchange server.
+- [PingCastle](https://www.pingcastle.com/) - Active Directory vulnerability detection and reporting tool.
 - [PlumHound](https://github.com/PlumHound/PlumHound) - More effectively use BloodHoundAD in continual security life-cycles by utilizing its pathfinding engine to identify Active Directory security vulnerabilities.
 - [Sandboxie](https://www.sandboxie.com/) - Free and open source general purpose Windows application sandboxing utility.
 - [Sigcheck](https://docs.microsoft.com/en-us/sysinternals/downloads/sigcheck) - Audit a Windows host's root certificate store against Microsoft's [Certificate Trust List (CTL)](https://docs.microsoft.com/en-us/windows/desktop/SecCrypto/certificate-trust-list-overview).