Science &
Technology

Acronyms and Abbreviations

Abbreviations, Acronyms, and Initialisms
Journal Abbreviations

Constants, Weights and Measures

Fundamental Physical Constants
Mathsoft Resources

Engineering

Engineering Statistics
Biomaterials Properties Database

Science

Astronomical Applications
Energy Citation Database
Entrez: Search and Retrieval System
Faces of Science (Africa-Americans in Science)
National Institute of Sciences and Technology
Online Encyclopedia of Integer Sequences
Protein Databank
Stardate Online
General Science

Periodic tables

Chemical Elements
Web Elements

Random Number Generators

Random Number Generator
True Random Number Service
Research Randomizer

Science and Writing Style

Columbia University Press

Units and Measures (Converters)

Dictionary of Units
Dictionary of Units and Measures
Megaconverter