There are not five sites I use daily; except my dictionary, Wikipedia (English version), Google (Search, books, scholar), our library site - almost daily.
I have a routine of checking actualities and news; The Guardian, Frankfurter Allgemeine Zeitung, NYT.
My Twitter feed which often points me to informative articles and sometimes even thrilling and exciting ones. I share those finds through the 'recommended' section of my website.