STEM Data Repositories and Data Sets

eFunda's mission is "to create an online destination for the engineering community, where working professionals can quickly find concise and reliable information to meet the majority of their daily reference needs."

Directory of state agency databases covering regulatory, scientific and policy information

A joint MIT/LBNL project, the Materials Project uses computational materials science to provide properties data and more on a wide range of materials for engineering and scientific applications.

A "computational knowledge engine" devoted to helping to bring together data from disparate sources to solve real-world problems computationally.

"The NIST Chemistry WebBook provides users with easy access to chemical and physical property data for chemical species through the internet. The data provided in the site are from collections maintained by the NIST Standard Reference Data Program and outside contributors."

The SIPRI Military Expenditure Database contains consistent time series on the military spending of countries for the period 1949–2022. The database is updated annually.