• Chemical and physical properties in Perkins Libraries
• Einstein Archives
• Eric Weisstein's World of Physics
• International critical tables of numerical data, physics, chemistry, and technology.
• Ultimate List of Calculators
• The Net Advance in Physics
• NIST: Physical reference data (includes physical constants, atomic spectroscopic data, molecular spectroscopic data, ionization data, X-ray and gamma-ray data, radiation dosimetry data, nuclear physics data, condensed matter data)
• Nobel Foundation
• Nuclear Research Reactors (IAEA)
• Periodic table
• Physics Teaching Resources
• Physics Today: Job Opportunities
• PhysicsWorld
• Smithsonian physical tables
• LBNL Isotopes Project
• Table of new nuclear moments
• Thermodex (guide to reference handbooks and searchable by property or by chemical class)
• Virtual Physics Laboratory
• WWW Virtual Library: Physics

Optics

• Optics.org (SPIE and IoP collaboration on industry information with Buyer's Guide, an online technical library (citations and abstracts), recruitment service).

Particle physics

• Online particle physics information
• The Particle Adventure
• An Introduction to particle physics
• Particle Data Group
• Interactions: Particle Physics News and Resources