Please consider buying the program, as the purchase will go directly towards its development and improvement. It is expensive, but it's a valuable resource. It is also possible to use free reference programs like Mendeley and Zotero. It is possible to import Endnote libraries into these programs (directly or via .xml conversion).

Dear J. Patrick Kelley

Thanks indeed for your reply.

I could also add that you could consider using Latex for your works. It is open source and produces elegant documents.

Dear David

Thank you very much.

Zotero for Mozilla firefox works well too.