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

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

Google's mission is to organize the world's information and make it universally accessible and useful.

Enables users to find, view, and share full-text scientific articles instantly.

A website that hosts a community-curated list of open access journals.

Semantic Scholar helps researchers find better academic publications faster

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

Mendeley is a desktop and web program produced by Elsevier for managing and sharing research papers, discovering research data and collaborating online.

Online rental service for scientific, technical and medical research.

Detect open access versions of articles, unlock free, legal scholarly PDFs.