Although there is a free online version of Endnote, this guide mostly refers to the desktop version (EndNote 2025) that must be purchased. U of A students and faculty can get a discounted price at ualberta.onthehub.com.
Best features: Can store 1 million references and PDFs; deduplicates large numbers of references; many reference types (helpful for accurate citation); highly customizable; ability to work offline; integrates with both MS Word and Google Docs.
Drawbacks: Price ($140); license tied to one device; steeper learning curve than other options.