ArchivesSpace is an open source, web application for managing archives information. The application is designed to support core functions in archives administration such as accessioning; description and arrangement of processed materials including analog, hybrid, and born-digital content; management of authorities (agents and subjects) and rights; and reference service. The application supports collection management through collection management records, tracking of events, and a growing number of administrative reports. The application also functions as a metadata authoring tool, enabling the generation of EAD, MARCXML, MODS, Dublin Core, and METS formatted data.