谷歌学术/谷歌镜像

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对70多个国家的61个数据库及门户进行跨语言搜索。WorldWideScience.org is a global science gateway accelerating scientific discovery and progress through a multilateral partnership to enable federated searching of national and international scientific databases.

支持集中搜索众多高校图书馆的图书资源目录

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百度学术搜索，是一个提供海量中英文文献检索的学术资源搜索平台，涵盖了各类学术期刊、学位、会议论文，旨在为国内外学者提供最好的科研体验。

基于开源软件建设学术搜索引擎，近130万篇文献。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.