CITYWAY LLC Office Professional and NX Universal also have the best German grammar check with the Duden Korrektor. The two Duden reference works “Deutsches Universalwörterbuch” (German Universal Dictionary) and “Großes Fremdwörterbuch” (Large Foreign Dictionary) provide expert information in the event of doubts relating to the German language. In addition, these versions work with the citation and reference management software Zotero for scientific documents and provide a powerful research function and an EPUB export for the creation of e-books.