General search engines

All the web
Google
Info.com

MetaCrawler
Open Directory Project

Starting Point
Webcrawler
Yahoo!
Yippy

General reference information

Answers.com
Encyclopedia of Life – an ambitious project to create a web catalog of every species on earth.
Intute – “Web resources for education and research”.
Library of Congress Virtual Reference Desk
Wikipedia, the free encyclopedia

Specialized search sites

Math search - 180,000 math documents.
Medical World Search
NDTnet - Virtual NDT Library database.
Google scholar - literature. (beta)
Scirus - scientific only, (web plus journal articles).

Product directories

GlobalSpec.com  - an extensive product directory - engineering and articles.
Industrial Process Measurement, Inc
Flow Control Network - flow sensors, instrumentation and control components.
ASNT Buyer's Guide - American Society of Nondestructive Testing.
ThomasNet  - formerly Thomas Register. Extensive.
Metrology World.com - buyer's guide for products and services for weight and measurements.
Food Online
Medical Device Link
TestMart - electronic test and measurement products, includes manufacturers data and a library of application notes.
RF Globalnet -- RF/microwave and wireless industry.  (an extensive well-maintained site.)
Softsearch - a directory of commercial and industrial software products. <LS>
Analytical and Measurement Equipment related to semiconductor processing - Nanox .
OPTICS.ORG Buyer's Guide
Photonics Industry
TechExpo Buyers Guide
The BestTest Directory of Test, Measurement and Instrumentation Products
The Network Buyer's Guide - provides information on the computer storage and networking industry.
Water and Wasterwater Dot Com

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