Check out our Public PubMed Collection with a selection of the most recent free guidelines and review articles on Critical Care and Emergencies.
2016 Guidelines for the Provision and Assessment of Nutrition Support Therapy in the Adult Critically Ill Patient: Society of Critical Care Medicine (SCCM) and American Society for Parenteral and Enteral Nutrition (A.S.P.E.N.)
The Geneva Foundation is an amazingly well organized directory of links organized by diseases and conditions mostly on gynecology and obstetrics. There is also an excellent link directory on free medical journals in all specialties, including Critical Care journals.
Medscape is an outstanding free medical resource with vast content in all medical specialties and has a section on medical calculators.