比菲尔德学术搜索引擎
超过3.4亿件科学文献来自超过11000免费来源。BASE是世界性大型搜搜引擎，存储来自互联网上免费的开放获取科学文献。BASE is one of the world\'s most voluminous search engines especially for academic web resources. BASE provides more than 340 million documents from more than 11,000 content providers. You can access the full texts of about 60% of the indexed documents for free (Open Access). BASE is operated by Bielefeld University Library.
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PDF SEARCH ENGINE - PDF,DOC,PPT,Ebook search ENGINE
FREE PDF SEARCH ENGINE. support all pdf,DOC,PPT,Ebook! free pdf download. You can search all kind of documents!
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chemBlink官网
chemBlink provides a free database of chemicals from around the World, searchable for product identifications, CAS numbers, SDS, formulas, suppliers and more. Contact us today.
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Find Articles官网
Find Articles论文搜索网提供多种顶极刊物的上百万篇论文，涵盖艺术与娱乐、汽车、商业与经融、计算机与技术、健康与健身、新闻与社会、科学教育、体育等各个方面的内容。
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DART-Europe官网
Portal for open access research theses. DART-Europe is a partnership of research libraries and library consortia who are working together to improve global access to European research theses. The DART-Europe partners help to provide researchers with a single European Portal for the discovery of Electronic Theses and Dissertations (ETDs).
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Library Genesis - Library Genesis Guide
Library Genesis 图书馆创世纪 - 中文 (中国). 从Library Genesis和lib gen下载免费的电子书 。Library Genesis and libgen website and proxies guide. Working links and mirrors for downloading ebooks and textbooks from lib gen, gen lib rus eс, libgen.io
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arXiv官网
arXiv is a free distribution service and an open-access archive for 2,357,785 scholarly articles in the fields of physics, mathematics, computer science, quantitative biology, quantitative finance, statistics, electrical engineering and systems science, and economics. Materials on this site are not peer-reviewed by arXiv.
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PubScholar公益学术平台
PubScholar公益学术平台https://pubscholar.cn/PubScholar公益学术平台是中国科学院作为国家战略科技力量的主力军，履行学术资源保障“国家队”职责，为满足全国科技界和全社会科技创新的学术资源基础保障需求，建设的提供公益性学术资源的检索发现、内容获取和交流共享等服务的平台。 平台在尊重知识产权和国际通行规范的前提下，发挥中国科学院自身拥有丰富且高质量学术资源的优势，带动国内外的学术资源机构积极合作，最大限度地开放优质学术资源。目前，平台整合集成了中国科学院的科技成果资源、科技出版资源和学术交流资源；OA环境下允许集成服务的学术资源；以及通过协议授权或其它合作共建
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