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EEVL
http://www.eevl.ac.uk/
提供工程、数学、计算科学方面的20个数据库的免费检索
reetradezone (CAPSXpert电子元器件数据库)
http://www.partminer.com/
the largest database of electronic component and electrical
information. Can access world's the largest dadabase:12,000,000
parts from 1,800 manufactures,....
需要注册用户名和密码，注册登记后即可免费检索
e-Print arXiv 预印本文献库
http://cn.arxiv.org/ （中科院理论物理研究所镜像站点）
http://arxiv.org/ （美国主站点）
由美国国家科学基金会和美国能源部资助,在美国洛斯阿拉莫斯（Los Alamos）国家实验室建立的电子预印本文献库，始建于1991年8月。该预印本资料库由Dr.
Ginsparg发起，旨在促进科学研究成果的交流与共享。目前包含物理学、数学、非线性科学、计算机科学四个学科共计17万篇预印本文献。研究者按照一定的格式将论文进行排版后，通过E-mail、FTP等方式、按学科类别上传至相应的库中。要说明的是，送入预印本库中的论文是不经过任何审核的，也没有任何先决条件决定某一论文能否送入e-print
arXiv库中，实际上这是默认了文责自负的原则。收入该库中的论文可以受到同行随时随地的评论，论文作者也可以对这种评论进行反驳，论文作者在将论文提交e-print
arXiv的同时，也可以将论文提交学术期刊正式发表，论文一旦在某种期刊上发表，在e-print arXiv中的该论文记录中将会加入文献正式发表期刊的卷期信息。
Ingenta数据库
http://www.ingenta.com/
目前世界最大的期刊数据库之一, 该库收录期刊已超过18,000种，拥有期刊文章索引（或文摘）7百多万篇，广泛覆盖了自然科学与社会科学多种学科的主题。数据库更新及时，基本与印刷本期刊出版时间保持同步，因此可以检索到最新的文献信息。该数据库免费检索，可以免费看到文章的题录与摘要信息。
2001年, Ingenta收购了UnCover数据库,收录期刊已超过20，000种，拥有期刊文章索引（或文摘）7百多万篇，广泛覆盖了多种学科，大约有51%属于科学、技术、医学和农林，40%属于社会科学、政法、商业，9%为艺术和人文科学。
Zentrablatt MATH(德国数学文摘)
http://www.emis.de/ZMATH/
可以免费获得三条记录
The Collection of Computer Science
Bibliographies
http://liinwww.ira.uka.de/bibliography/index.html
该数据库收集了许多计算机学科的参考文献，包括期刊、会议、技术报告等。可以检索获得文献的题目、出处和作者等信息，但没有摘要和全文。许多文献配有相关链接。
CiteSeer.1st
http://citeseer.ist.psu.edu/cs
计算机与信息科学方面的检索引擎。
Pubmed
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?tool=infotrieve
Pubmed是美国国立卫生研究所（NIH）下属美国国立医学图书馆（NLM）开发的因特网检索系统，主要提供基于WEB的medline数据库检索服务,是印刷刊《Index
Medicus》、《Index to Dental Literature》和《Internationgal
Nursing Index》的光盘版，数据摘自3700种期刊，是生物医学的主要数据库。时间跨度1966年至今。
TRIS online
http://trisonline.bts.gov/search.cfm
TRS是美国 national transportation library 和transportation
research board 创建的题录数据库，可以检索文章题录与文摘，为找到全文提供详细的线索.
Civil Engineering Database
http://www.pubs.asce.org/cedbsrch.html
A searchable database of citations and abstracts for
ASCE documents published since 1973. It provides access
to all the journals, conference proceedings, books,
standards, manuals, magazines, and newsletter. Subject
areas include aerospace, earthquake, environmental,
forensic, geotechnical, structural and architectural
engineering, bridges, cold regions, computer practices,
construction, engineering mechanics, highways, hydrology,
hydraulics, irrigation and drainage, transportation,
urban planning, water resources, and waterway, port,
coastal and ocean engineering. Also includes ASCE Market
Place Computer Software Buyer's Guide.
DOE information bridge
http://www.osti.gov/bridge/index.jsp
Provides access to full-text United States Dept. of
Energy research and development in physics, chemistry,
materials, biology, environmental sciences, energy technologies,
engineering, computer and information sciences, renewable
energy, and other topics; includes the full-text and
bibliographic records of DOE-sponsored report literature
produced by the DOE and DOE contractor research and
development community. Includes full-text reports received
in paper copy or electronic format from DOE laboratories
or grantees at its Office of Scientific and Technical
Information (OSTI) since Jan. 1996.
National transportation statistics
http://www.bts.gov/publications/nts/index.html
NTS is compiled and published by the Bureau
of Transportation Statistics (BTS) of the U.S. Department
of Transportation. It presents basic information on
America's transportation system on a national scale,
including the physical network, economic performance,
and its safety record, energy use, and related air emissions.
It is a companion volume to the Bureau's Transportation
Statistics Annual Report (TSAR), which is a comprehensive
analysis of the data presented in NTS.(需付国际流量费）
TRB rip: transportation research
board ,research in progress Database
http://rip.trb.org/
contains about 6,600 records of current
or recently completed transportation research projects.
Each month about 100 new RiP projects are added to the
database and another 150 RIP records are updated. Most
of the RiP records are projects funded by Federal and
State Departments of Transportation. University transportation
research is also included.
美国政府报告数据库
http://www.ntis.gov/
通过该主页可以浏览或检索90年以来的有关科学、技术、工程和商业信息报告，该数据库为题录型，主要报道PB报告、非密或解密的AD报告、部分NASA报告和DOE报告，以及其他类型的科技报告。有少量记录带有摘要，主要是自1999年以来的收录的有关商业、环境和医疗卫生，以及计算机产品方面报告。
NASA报告数据库
http://www.sti.nasa.gov/
美国能源部DOE报告数据库
http://www.osti.gov/
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