The Repurposing Of All Drugs, Mapping All Paths (ROADMAP) project was spearheaded by the Castleman Disease Collaborative Network (CDCN) to create a resource that would provide guidance for rare disease organizations seeking to pursue drug repurposing, based on real world experiences. Its aim was to identify all the paths that can be taken to repurpose drugs, highlight the roles of various stakeholders, and centralize information on how to do this most effectively.