Doorstop is a requirements management tool that facilitates the storage of textual requirements alongside source code in version control.
When a project leverages this tool, each linkable item (requirement, test case, etc.) is stored as a YAML file in a designated directory. The items in each directory form a document. The relationship between documents forms a tree hierarchy. Doorstop provides mechanisms for modifying this tree, validating item traceability, and publishing documents in several formats.