A unique search tool, helping you to find free academic articles and books

Baidu Scholar aims to become the biggest, most comprehensive research platform in China.

Semantic Scholar helps researchers find better academic publications faster

A service to help the academic community find academic content, researchers, and more.

Online rental service for scientific, technical and medical research.

Access to major journals in the biomedical and related social sciences fields.

Aggregator of open access research papers for researchers and repositories.

Search metadata records for journal articles, field-specific, for software.

Article recommendation and literature discovery service in biology and medicine.

A global science search engine designed to accelerate scientific discovery and progress by the sharing of scientific knowledge.