- Physics and Science Reference by PhysLINK.com
 Physics / science reference, physical constants, online unit conversions, periodic table of elements, exact time, fundamental physical formulae and equations.
- Astronomical Constants from NASA
Astronomical/space constants and equations.
- Biocatalysis/Biodegradation Database
University of Minnesota Biocatalysis/Biodegradation Database lists microbial biocatalytic reactions and biodegradation pathways primarily for xenobiotic, chemical compounds.
- Engineering Power Tools
Engineering software solves many common engineering problems quickly and efficiently. Includes unit converter, and many frequently- used data tables such as physical constants, properties of materials, screw threads, and piping pressure drop. Free downloads. Win3.x/95/98/NT.
- EquationSheet.com
Searchable directory, arranged by field, of equations, constants, symbols and SI units. Also features LaTEX utilities, software links.
- Erik Max Francis' physics pages
Information on Kepler's laws, the laws list, illustrated orders of magnitude, and a physics reference.
- Favorite Mathematical Constants
Research-level essays about mathematical constants from Steven Finch
- Fundamental Physical Constants from NIST
CODATA Internationally recommended values for a wide range of physical parameters (speed of light, Avogadro's constant, masses of elementary particles, Planck constant, and acceleration of gravity).
- GrayLIT Network
Provides a full-text search across the gray literature of multiple government agencies within a science portal of technical reports.
- International Network for the Availability of Scientific Publications (INASP)
A co-operative network of partners aiming to improve world-wide access to scientific information.
- Molecular Weight Calculation
Web-based utility for finding the molecular weight of any chemical for which you enter the formula.
- RefScout
A weekly, scientific reference mailing service. Screens databases covering life and medical sciences for the key words or the combination of key words specified and will automatically update with any abstract that has come up during the last seven days. Free service.
- The Constants and Equations Pages
Expanding reference resource for science, math and astronomy
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