- OAIster is a digital library catalog that provides access to academic resources by harvesting metadata from open archives using the Open Archives Initiative Protocol for Metadata Harvesting (OAI-PMH). - It contains over 23 million records from over 1100 organizations worldwide, representing a variety of digital materials like articles, books, audio, images, and datasets. - OAIster is now maintained by OCLC to ensure its continued support and to broaden the scope of resources available in WorldCat. It provides access to scholarly resources that may not be found through other search engines or library catalogs.