There are several ways to add a reference to a library: manually, or by exporting, importing, copying from another EndNote library, or connecting from EndNote. EndNote's main competitors are Mendeley and Zotero.ĮndNote groups citations into 'libraries' with the file extension *.enl and a corresponding *.data folder. EndNote was written by Richard Niles, and ownership changed hands several times since it was launched in 1989 by Niles & Associates: in 2000 it was acquired by Institute for Scientific Information’s ResearchSoft Division, part of Thomson Corporation, and in 2016 by Clarivate (then named Clarivate Analytics). EndNote is a commercial reference management software package, used to manage bibliographies and references when writing essays, reports and articles.