Citavi is not available for Mac but there are plenty of alternatives that runs on macOS with similar functionality. The best Mac alternative is Zotero, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Citavi and 16 are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to Citavi are Mendeley (Freemium), JabRef (Free, Open Source), ReadCube Papers (Paid) and EndNote (Paid).
RefWorks - an online research management, writing and collaboration tool - is designed to help researchers easily gather, manage, store and share all types of information, as well as generate citations and bibliographies.
UbikReader is the new way to organize your documents. Multitask while you read, annotate, write notes and share your documents with ease. No more worrying about how to manage your large, cluttered library of documents.
Bibliography.com is a free, easy-to-use multi-platform bibliography and citation generator that automatically generates accurate citations for students and teachers. It’s the world’s fastest and most accurate citation generator and management tool.
Bibfilex is a free bibliographic manager for GNU/Linux, Windows and OS X. It's useful to create and to manage archives of bibliographical items (books, articles, etc.) with possible attachments of any kind according to Biblatex structure and rules.