商业类搜索引擎及目录索引

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工程技术 Engineering：

EEVL E-journal Search Engine - Allows full-text searching of engineering e-journals.

Engineer Search - Search for an engineer, locate an engineering firm, find subcontract consulting engineers or identify an engineering employer in the region you wish to work.

EngineerSupply.Com - Engineering portal featuring information, reference, products, services, and collaboration among the engineering community.

GlobalSpec - Search engineering catalogs for products. Over 3 million specified.

icrank - Search for engineering resouces on the web.

MotionNET.com - Free technical web portal for engineers and technical staff. Provides a categorized database of engineering products and companies.