One of the most voluminous search engines specifically for academic web resources. More than 60% of the indexed documents are available as full-text for free.
This is the world’s largest aggregator of open-access research papers, hosting over 298 million articles harvested from thousands of institutional repositories. download free journal articles
An AI-powered engine developed by the Allen Institute for AI. it uses machine learning to highlight the most important citations and often links directly to free versions. 2. Dedicated Open Access Repositories One of the most voluminous search engines specifically