OpenBAS by Filigran is a Breach and Attack Simulation (BAS) platform designed to plan, execute, and conduct dynamic attack scenarios for accurate responses during incidents. It enhances cybersecurity posture by addressing vulnerabilities and refining operations. OpenBAS builds customizable simulations for various industry needs, evaluates security posture on both technical and human sides, and improves team dynamics with real-time feedback. The platform enables continuous skill enhancement and insight gathering post-simulation. OpenBAS designs scenarios ranging from simple to complex, adapts responses based on participant feedback, and assesses team reactions to incidents. It integrates threat intelligence from OpenCTI to streamline scenario updates with the latest cyber threat insights, techniques, and relevant adversary behaviors. OpenBAS facilitates team and technology evaluations regarding actual cyber threats and provides collaborative feedback on scenarios within the platform for detailed analysis. It enhances team skills and cybersecurity tools through frequent checks tailored to specific audiences and technologies with granular controls. Planners and purple teams can use pre-defined attacks, documents, and challenges to assess security gaps. OpenBAS can be deployed as an open-source Community Edition on-premise or as a fully managed enterprise instance hosted by Filigran with self-service provisioning.