Dryad a curated general-purpose repository that makes the data underlying scientific publications discoverable, freely reusable, and citable.

Information on the human impact of disasters, such as the number of people killed, injured or affected, as well as disaster-related economic damage estimates and disaster-specific international aid contributions. From the Centre for Research on the Epidemiology of Disasters (CRED).

The National Nuclear Data Center (NNDC) collects, evaluates, and disseminates nuclear physics data for basic nuclear research and for applied nuclear technologies.

Publications, data, and analyses about science and engineering resources in the US.

Provides access to data compiled and distributed by the National Institute of Standards and Technology (NIST) Standard Reference Data Program. Data includes thermochemical, thermophysical, ion energies, etc.

The Physical Measurement Laboratory (PML) develops and disseminates the national standards of length, mass, force and shock, acceleration, time and frequency, electricity, temperature, humidity, pressure and vacuum, liquid and gas flow, and electromagnetic, optical, microwave, acoustic, ultrasonic, and ionizing radiation.

NOAA's National Climatic Data Center (NCDC) is the world's largest repository of weather and climate data and information. Data sources are as varied as paleoclimatic samples to handwritten observations to satellite and radar imagery less than an hour old.

The Sloan Digital Sky Survey (see www.sdss.org for general information) will map one-quarter of the entire sky and perform a redshift survey of galaxies, quasars and stars.

The Astrophysics Data System (ADS) is a NASA-funded project which maintains three bibliographic databases containing more than 4.8 million records in Astronomy and Astrophysics, Physics. Also includes ArXiv e-prints.