205 reference datasets in 27 categories. Every page below is a readable table with field definitions, source notes and caveats. Each dataset is also served as JSON, YAML, and TOON from one URL, free and CC0, with no signup and no API key.
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5 categories · 49 datasets
Syntax, features, and comparisons of major programming languages.
12 datasetsFundamental data structures with properties and complexity analysis.
10 datasetsClassic algorithms, strategies, and complexity.
7 datasetsSoftware design patterns with descriptions and use cases.
8 datasetsKey terminology in artificial intelligence and machine learning.
12 datasets9 categories · 81 datasets
Operating system concepts, kernels, and process management.
5 datasetsCommon Unix/Linux shell commands and their usage.
11 datasetsDevOps practices, CI/CD, and infrastructure as code.
7 datasetsCloud service models, providers, and deployment patterns.
7 datasetsNetwork protocols, models, and architecture.
7 datasetsComplete reference of HTTP response status codes.
13 datasetsStandards, protocols, and APIs for web development.
13 datasetsDifferent database systems and their characteristics.
12 datasetsSecurity principles, threats, and defensive practices.
6 datasets5 categories · 31 datasets
Core mathematical concepts, theorems, and notation.
9 datasetsCore physics concepts and laws.
6 datasetsChemical elements, compounds, and reactions.
5 datasetsFundamental concepts in biology: cell biology, genetics, evolution, and ecology.
6 datasetsCelestial objects, phenomena, and cosmology.
5 datasets8 categories · 44 datasets
Countries, capitals, landforms, and climate.
5 datasetsMajor historical events, civilizations, eras, and turning points that shaped the modern world.
6 datasetsEconomic theories, indicators, and systems.
5 datasetsLegal systems, terminology, and landmark cases.
5 datasetsMajor philosophical traditions, schools of thought, key thinkers, and fundamental questions.
6 datasetsPsychological concepts, disorders, and theories.
6 datasetsLanguage structure, phonetics, and semantics.
5 datasetsLiterary movements, genres, narrative techniques, and major works across history.
6 datasets