• AI Computing Answers_Wolfram Alpha
  • Bookshelf is an archive of books and reports within the biomedical and life sciences field.
  • Curriki Library
  • Encyclopedia Britannica
  • Find Articles
  • Google Books has more than 10 million free books available for users to read and download. Google's free books are made available to read through careful consideration of and respect for copyright law globally: they are public-domain works, made free on request of the copyright owner, or copyright-free, e.g. US government documents.
  • Google Scholar allows you to search scholarly literature across many disciplines and sources from a variety of databases.
  • Internet Archive
  • Library Genesis
    This fantastic digital shadow library, also known as libgen, gives you free access to millions of your favorite books and papers in epub, pdf, mobi, and many other formats as eBooks, from romance to science fiction, and everything in between. It includes textbooks and journal articles, academic works, graphic novels, and comics.

  • MEDLINE primarily contains citations from journals with articles that are indexed with MeSH (Medical Subject Headings).
  • Open Library (Open Library is a non-profit project of the Internet Archive that has been funded in part by grants from the California State Library and the Kahle/Austin Foundation. Open Library is an open project: the software is open, the data is open, the documentation is open, and we welcome your contributions.)
  • OpenStax
  • Open Access Library
    Open Access Library (OALib) consists of:
    • the Search Engine, based on a database with metadata of Open Access (OA) papers
    • the Journal with OALib Articles,
    • the Index with metadata entries of external OA journal articles,
    • the Repository with own OALib PrePrints as well as external preprints and postprints, all stored in one of the 322 OALib Disciplinary Repositories.

    OALib currently hosts links and metadata for over 5,706,041 open access articles from a variety of academic disciplines. You can download all full-text articles from your search results for free.

  • Pubmed is the most popular and free-to-use medical search engine. It allows you to search for biomedical and life sciences literature, and also covers related fields such as bioengineering, behavioral sciences, and chemical sciences.
  • Project Gutenberg
  • PubMed Central (PMC) contains full-text articles from journals that have been selected by NLM for archiving. 
  • ScienceDirect is a medical search engine that allows you to find articles from medical journals.
  • Scopus is an abstract and citation database.
  • Science Huβ
  • The National Science Digital Library
  • The Free eBook
  • The Free Library
  • The OER Commons is a public digital library of open educational resources. Explore, create, and collaborate with educators around the world to improve curriculum.
  • TCM Database@Taiwan: The World's Largest Traditional Chinese Medicine Database for Drug Screening In Silico. The Databases aim to bridge the East-West divide of drug discovery.
  • The Cochrane Library is a collection of databases that contain different types of high-quality, independent evidence used by healthcare decision-makers to make informed decisions.
  • The Chinese Medicinal Material Images Database documents over 420 crude drugs commonly used in Chinese Medicine practice. The database provides drug information, including source, origins, description,  quality,  taste, and clinical indications. Annotated high-quality photographs are used to Illustrate and identify the key properties and selected microstructures of the drugs. The search function enables the convenient retrieval of records. This online database was developed as a teaching and learning platform for the subjects of Chinese Materia Medica and Authentification of Chinese Materia Medica, and to promote the popularization of Chinese Medicine knowledge.
  • The Traditional Chinese Medicine Resource Platform has online resources on traditional Chinese medicine. It provides multiple resources and valuable reference documents for the traditional Chinese medicine industry and related industries, including electronic pharmacopeia, traditional Chinese medicine-related databases, scientific data resource search, traditional Chinese medicine policies and regulations, and pharmaceutical production quality management documents (GMP SOP) and registration requirements for proprietary Chinese medicines, etc.