SnowyOwl

SnowyOwl is a reference manager designed to be easy-to-use and user-friendly. It supports multiple libraries, and provides groups, tags, keywords, etc. to help you organize your dataset. You can easily sync your library, by putting it into your favorite web drive, such as iCloud, onedrive... PDF Annotations are automatically extracted, and your documents content is searchable. Take notes with the built-in markdown editor. Cite directly inside Pages and Microsoft Word.