Noodle Tools http://www.noodletools.com/ free version or Lewisburg pays $240 a year for the H.S.

Power Library http://www.powerlibrary.org/ free

Ask Here PA http://www.askherepa.org/ chat with a virtual librarian - Open 24/7 - free

Oxford Reference Online http://www.oxfordreference.com/pub/views/home.html subscription fee

Turn It In http://turnitin.com/static/index.html approximately $3000 for year 1 - $1200 after that