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获取500多万篇OA文献 | Open Access Library (www.oalib.com) is an academic search engine and publisher. You can download research papers for free and submit your paper to it. It is a shared academic database.

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Wiley在线图书馆

中国知网知识发现网络平台—面向海内外读者提供中国学术文献、外文文献、学位论文、报纸、会议、年鉴、工具书等各类资源统一检索、统一导航、在线阅读和下载服务。涵盖基础科学、文史哲、工程科技、社会科学、农业、经济与管理科学、医药卫生、信息科技等十大领域。

MDPI is a publisher of peer-reviewed, open access journals since its establishment in 1996.

Maximizing the impact of research through openness. Because science works best when research is open.