Omeka is a free, open-source web-publishing platform that allows users to display collections of digital items online. It was created by the Roy Rosenzweig Center for History and New Media to help historical organizations build searchable digital collections and exhibits. The document introduces Omeka.net, the hosted version of Omeka that provides 500MB of free storage. It notes that users should pay attention to image sizes to avoid large file sizes that exceed the storage limit. Dublin Core is a standard for describing digital objects that Omeka uses to organize collection metadata in a way that is accessible and searchable.