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JavaScript
Open-source, IIIF-based media viewer for sharing books, manuscripts, newspapers, film, audio, and 3D objects on the web — used widely by libraries, archives, and museums as their public-facing digitized-collection viewer. Renders images, PDFs, audio, video, and 3D files through a single embeddable npm package driven by the IIIF (International Image Interoperability Framework) presentation API, rather than format-specific custom viewers for each media type.