Data Sources

This is an evolving list of interesting or unique data sources I've come across.

Materials and Engineering

MatWeb - As searchable database of material properties including data sheets for polymers, metals, ceramics, and other engineering materials.

Engineering Toolbox - Resources, tools, and basic information for engineering and design of technical applications.

Google Scholar - A freely accessible web search engine that indexes the full text or metadata of scholarly literature across an array of publishing formats and disciplines.
Semantic Scholar - A free, AI-powered research tool for scientific literature, based at the Allen Institute for AI.
arXiv - A repository of electronic preprints (known as e-prints) approved for publication after moderation, that consists of scientific papers in the fields of [[mathematics]], physics, astronomy, electrical engineering, computer science, quantitative biology, statistics, mathematical finance and economics, which can be accessed online.