Atomic Red Team - Small and highly portable detection tests mapped to MITRE ATT&CK.

Cybersecurity Maturity Matrix - A simple tool for workshopping cybersecurity maturity in the context of customizable security domains, and across the NIST Five Functions. (more)

Cybersecurity models - An open source collection of cybersecurity, information security, and information risk management models.

Cybersecurity Bingo! - A silly game to help you pass the time. But, flexible enough that it can be used for most of your online or in-person bingo needs.

Surveyor - A cross-platform baselining, threat hunting, and attack surface analysis tool for security teams.