爱学术是一家专业的学术文献分享平台，覆盖各个行业期刊论文，学位论文，会议论文，标准，专利等各类学术资源，是国内最大的学术文献交流中心和论文资源免费下载网站。
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.
socolar
科学网是由中国科学院、中国工程院和国家自然科学基金委员会主管，中国科学报社主办的综合性科学网站，主要为网民提供快捷权威的科学新闻报道、丰富实用的科学信息服务以及交流互动的网络平台，目标是建成最具影响力的全球华人科学社区。
First published in 1869, Nature is the world’s leading multidisciplinary science journal. Nature publishes the finest peer-reviewed research that drives ground-breaking discovery, and is read by thought-leaders and decision-makers around the world.
Our technology is in the service of knowledge. We provide the nexus where it is collected, certified, stored and shared.
物質・材料に関する研究を専門的に行う公的研究機関として、「明日を創る材料研究」をテーマに、未来を拓く物質・材料の研究に日々取り組んでいます。
Scientific Research Publishing is an academic publisher with more than 200 open access journal in the areas of science, technology and medicine. It also publishes academic books and conference proceedings.
Xerfi est le leader des études sectorielles. Xerfi.com présente son catalogue d'études de marché en France et à l'international sur l’ensemble des marchés pertinents.
American Economic Association
Welcome to Caltech Magazine (formerly Engineering & Science) - Caltech Magazine
万方数据知识服务平台-中外学术论文、中外标准、中外专利、科技成果、政策法规等科技文献的在线服务平台。
arXiv.org e-Print archive
DOAJ is a community-curated online directory that indexes and provides access to high quality, open access, peer-reviewed journals.
National Center for Biotechnology Information
外文期刊文章基本检索
More than 200 mio. scientfic documents from more than 8000 content providers. BASE is one of the world's most voluminous search engines for academic web resources.
Library Genesis
sci-hub
