SAE Standards Search Engine: Find and order on-line.

ASME Codes & Standards Search Engine: Find and order on-line.

ISO Standards Glossary
A quick and easy to use reference for which ISO standard covers the topic of interest. Serves a variety of purposes, from helping identify appropriate international standards, to providing official titles and descriptions. Standards broken down by number, and then within each page, listed in ascending order. To identify a standard, simply navigate to the standard you are seeking, or search using the facility provided.

NSSN:
A National Resource for Global Standards is a World Wide Web-based system designed to provide users with a wide range of standards Information from major standards developers, including developers accredited by the American National Standards Institute, other U.S. private sector standards organizations, government agencies, including the U.S. Department of Defense, and international standards organizations.

ANSI Standards Conformity Assessment Program:
Addresses the ANSI program to address increasing marketplace and regulatory emphasis over the last several years on mechanisms for assessment of conformity to standards; and the roles of product testing, certification and management system registration.

ISO TC184/SC4 - Developers of International Industrial Data Standards
TC184/SC4 is a standing subcomittee of the International Organization for Standardization. SC4 is developing standards which provide capabilities to describe and manage product data throughout the life of the product. SC4 is made up of Working Groups and the Quality Committee

The World Wide Web Consortium
The W3C, owners of the XML specification, site that's a great place to start for inquiries about any area of XML. Find out what they're up to!