The five alert services (all free) discussed are:
A service many of you are probably familiar with. Wowbrary alerts users to new books at numerous public libraries around the U.S.
Like many services on the WWW, the four mentioned in the MakeUseOf article are all (with the exception of Wowbrary) variations on a theme. Since the price is right (free), sampling all of them is easy to find the one(s) that might work best for your info need.
Read the Complete MakeUseOf.com Article: “5 Websites That Alert Book Lovers About New Book Releases”