IM3I is an immersive multimedia management and publishing platform that provides a framework for searching, summarizing, and visualizing large multimedia archives. It is based on a service-oriented architecture and can integrate a variety of content processing, analysis, indexing, tagging, annotation, search, and publishing services. The platform has been applied in media production workflows, educational content workflows, and for publishing archived content. It allows flexible composition of services into pipelines and custom interfaces to support various content use cases and user roles.