gram

Gram is an open-source threat modeling tool developed by Klarna that enables security teams to create, visualize, and collaborate on system architecture diagrams with embedded security controls. It is designed for security engineers and developers to identify and document potential threats early in the design phase, integrating seamlessly into existing workflows. Its interest lies in being a purpose-built, internal tool open-sourced to the community, offering a practical alternative to generic diagramming software for security-focused modeling.