CiteSeeXr is a scientific literature digital library and search engine that focuses primarily on the literature in computer and information science. It provides improvements in functionality, usability, availability, cost, comprehensiveness, efficiency, and timeliness in the access of scholarly knowledge.
Computer Database contains articles regarding computer-related product introductions, news, and reviews in areas such as hardware, software, electronics, engineering, communications, and the application of technology.
Science.gov is a search engine for government science information and research results. Currently in its fourth generation, Science.gov provides search of more than 50 million pages of science information with just one query, and is a gateway to over 1,800 scientific Web sites.
Web of Science is the world's largest, high-quality interdisciplinary database back to 1965. All subject areas are covered, but the sciences are covered very well. WoS is easy to use, but it has many advanced features that make it an excellent tool for advanced researchers. See the Web of Science page for searching instructions.
You can search all these databases, or select only one.
Web of Science (Arts & Humanities Index, Science Citation Index, Social Sciences Index)
BIOSIS (the leading biological sciences database)
Current Contents (current awareness database covering more than 7,000 journals)