Supplejack is DigitalNZ's tool for aggregating, searching and sharing metadata records. Supplejack is used to collect metadata about millions of items, from hundreds of data sources, across many different data formats including HTML, RSS, XML, OAI-PMH and RDF/XML. It transforms messy data, creates a unified search index and makes consistent metadata widely available via an open API data service. It was built using open source technology by DigitalNZ and the National Library of New Zealand.