The document summarizes the SortingHat tool, which helps unify identities across software projects and organizations. It merges duplicate identities using matching algorithms and affiliations. It allows adding, editing, and removing identities as well as merging them. Identities and their affiliations with organizations are stored in a graph database, and the tool provides both a command line interface and Python library for programmatic access. It was presented at the ICSE 2019 conference to help unify identities in open source projects and organizations.