The Institute of Medicine (IOM) is an independent, nonprofit organization that works outside of U.S. government to provide unbiased and authoritative advice to decision-makers and the public.
WikiDoc is an open source website that allows an international community of healthcare professionals to add and edit medical content in a process termed co-creation. As the name implies, it works similarly as Wikipedia, with similar strengths and weaknesses.
The Internet Archive offers permanent access for researchers, historians, scholars, people with disabilities, and the general public to historical collections that exist in digital format. Some interesting medical books are available, and one must use the search engine to look for the areas of interest.