Google Scholar Subject Area: General, Multi-Subject
Google Scholar provides a simple way to broadly search for scholarly literature. From one place, you can search across many disciplines and sources: peer-reviewed papers, theses, books, abstracts and articles, from academic publishers, professional societies, preprint repositories, universities and other scholarly organizations. Google Scholar helps you identify the most relevant research across the world of scholarly research. (Provides full–text access to various resources)
OAIster : Union Catalog of Digital Resources Subject Area: General, Multi-Subject
OAIster is a huge union catalog of digital resources.
BASE:Biefeld Academic Search Engine Subject Area: General, Multi-Subject
BASE is the name of the multi-disciplinary search engine for academically relevant web resources which was created and developed by Bielefeld University Library.
The Virtual Library Subject Area: General, Multi-Subject
The Virtual Library is a catalogue of the web.
USA Government Science Portal Subject Area: General, Multi-Subject
Science.gov is a gateway to government science information and research results.
Find Article in BNET Subject Area: General, Multi-Subject
Offers academic full text documents in the fields of Science and various fields
Dogpile Subject Area: General, Multi-Subject
All the best search engines piled into one.
The Internet Public Library Subject Area: General, Multi-Subject
DMOZ Open Directory Project Subject Area: General, Multi-Subject
The Open Directory Project is a human-edited directory of the Web. It is constructed and maintained by a vast, global community of volunteer editors.
TechXtra Subject Area: Engineering + Mathematics
Find articles, key websites, books, the latest industry news, job announcements, e-journals, e-prints, technical reports, the latest research, thesis and dissertations and more.
Scirus : For Scientific Information Only Subject Area: Science
Scirus is the most comprehensive scientific research tool on the web. With over 350 million scientific items indexed at last count, it allows researchers to search for not only journal content but also
scientists’ homepages, courseware, pre-print server material, patents and institutional repository and website information.Athenus : The Engineering and Science Search Engine Subject Area: Science + Engineering