Zotero is a free, open source citation manager that allows users to store, organize, and cite research sources. It works as a browser extension for Firefox, Chrome, and Safari, as well as a standalone desktop app. Zotero makes it easy to collect research from the web, organize sources into collections, and cite sources in papers using different styles like Chicago or MLA. It automatically generates bibliographies based on the sources cited. Zotero has been updated several times since its initial release in 2006 and is currently on version 5.0.