• arXiv.org
Open access to 788,666 e-prints in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance and Statistics.
• Computer Index of Neutron Data (CINDA)
CINDA contains bibliographic references to measurements, calculations, reviews, and evaluations of neutron cross-sections and other microscopic neutron data; it also includes index references to computer libraries of numerical neutron data available from four regional neutron data centers.
• Interactions
Resource for information about particle physics, including press releases, articles, news, event listings and images.
• The laws list
Laws, rules, principles, effects, paradoxes, limits, constants, experiments, & thought-experiments in physics.
• The Nist Reference on Constants, Units, and Uncertainty
This site addresses three topics: fundamental physical constants, the International System of Units (SI), which is the modern metric system, and expressing the uncertainty of measurement results.
