Having text organized in folders by subjects, authors or whatever is necessary, so when writing articles or essays is easier to spot the needed references. That's best for me. Review collected by and hosted on G2.com.

That lately archives can't be saved, in regards of the highlights and notes you do unless you pay for the service, foxit was a great tool and many students use that, but by making basic features under payment, for sure that will decrease its usage. Review collected by and hosted on G2.com.