- Bureau International des Poids et Mesures (BIPM)
 - Ensures world-wide uniformity of measurements and their traceability to the SI, and carries out measurement-related research (in French and English). - Freedom2Measure
- Asserts that the imposition of the metric system is an affront to one's basic rights.
- International System of Units (SI)
- Essentials, background, and bibliography on the SI, the modern metric system.
- Metric Numbers to Remember
- Metric System (SI)
- Information on the International System.
- Metrication.com
- Examines the metric system as it pertains to products, clothing, engineering, drafting, in the home, and more.
- U.S. Metric Association (USMA)
- National nonprofit organisation, founded in 1916, which advocates U.S. conversion to the International System of Units (SI), also called the modern metric system.
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