Aggregators
National Digital Library of India
National Digital Library of India (NDLI) is a virtual repository of learning resources which is not just a repository with search/browse facilities but provides a host of services for the learner community.
National Archives of India Portal
An initiative of NAI to make its rich treasure of Indian Archival Records available to one and all. Abhilekh Patal contains the reference media of more than 2.7 million files held by the National Archives of India.
PDF Drive is a free search engine which allows you to search, preview and download millions of PDF files into your devices.
Paperity is the first multi-disciplinary aggregator of Open Access journals and papers, "gold" and "hybrid". Paperity is multi-disciplinary and covers all fields of research. All articles indexed by Paperity are Open Access (OA).
OA.mg is a search engine for academic papers. Whether you are looking for a specific paper, or for research from a field, or all of an author’s works – OA.mg is the place to find it.
Semantic Scholar provides free, AI-driven search and discovery tools, and open resources for the global research community.