| 1 | DOAJ (Directory of Open Access Journals) | https://doaj.org | Peer-reviewed, open access scholarly journals. | Journals | Multidisciplinary | 
    
      | 2 | OpenStax | https://openstax.org | Free, peer-reviewed college textbooks. | Textbooks | STEM, Business, Social Sciences | 
    
      | 3 | MIT OpenCourseWare | https://ocw.mit.edu | Course materials from MIT, free to access. | Courses, Lectures | Engineering, CS, Science, Humanities | 
    
      | 4 | Saylor Academy | https://saylor.org | Full-length college-level online courses. | Courses | Business, CS, English, Math, more | 
    
      | 5 | PubMed Central (PMC) | https://ncbi.nlm.nih.gov/pmc | Biomedical and life sciences open journal archive. | Journals | Medicine, Health, Biology | 
    
      | 6 | CORE | https://core.ac.uk | Aggregates millions of OA research papers. | Research Articles | Multidisciplinary | 
    
      | 7 | ERIC | https://eric.ed.gov | Open access to education research. | Articles, Reports | Education, Teaching, Policy | 
    
      | 8 | LibreTexts | https://libretexts.org | Open textbooks curated by academics. | Textbooks | STEM, Medicine, Humanities | 
    
      | 9 | Open Textbook Library | https://open.umn.edu/opentextbooks | Peer-reviewed, openly licensed textbooks. | Textbooks | Business, Law, Education, Sciences | 
    
      | 10 | Project Gutenberg | https://gutenberg.org | Over 60,000 free eBooks, especially literary classics and historical works. | eBooks, Literature | Literature, Philosophy, History | 
    
      | 11 | SWAYAM | https://swayam.gov.in | Govt. of India MOOC platform with free online courses from top Indian institutes. | Courses, Videos | Engineering, Humanities, Sciences, Law | 
    
      | 12 | NDLI (National Digital Library of India) | https://ndl.iitkgp.ac.in | A digital repository of educational content curated by IIT Kharagpur. | Books, Theses, Lectures | All disciplines | 
    
      | 13 | e-PG Pathshala | https://epgp.inflibnet.ac.in | UGC initiative for postgraduate course content. | Modules, e-Text, Video | Arts, Sciences, Social Sciences | 
    
      | 14 | NPTEL | https://nptel.ac.in | IITs’ video lectures and MOOCs platform. | Lectures, Courses | Engineering, Science, Management, Humanities | 
    
      | 15 | Shodhganga | https://shodhganga.inflibnet.ac.in | Repository of Indian research theses and dissertations. | Theses, Dissertations | All disciplines | 
    
      | 16 | VIDWAN | https://vidwan.inflibnet.ac.in | Expert database of researchers and scientists in India. | Researcher Profiles, Publications | Multidisciplinary |