The catalog
185 reference datasets in 27 categories. Every page below is the actual data, laid out as tables — not a description of it. Each dataset is also served as JSON, YAML, and TOON from one URL, free and CC0, with no signup and no API key.
Categories
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Programming Languages
Syntax, features, and comparisons of major programming languages.
10 datasets → -
HTTP Status Codes
Complete reference of HTTP response status codes.
10 datasets → -
Data Structures
Fundamental data structures with properties and complexity analysis.
10 datasets → -
Algorithms
Classic algorithms, strategies, and complexity.
7 datasets → -
AI & ML Terms
Key terminology in artificial intelligence and machine learning.
10 datasets → -
Web Technologies
Standards, protocols, and APIs for web development.
9 datasets → -
Unix Commands
Common Unix/Linux shell commands and their usage.
9 datasets → -
Design Patterns
Software design patterns with descriptions and use cases.
7 datasets → -
Database Types
Different database systems and their characteristics.
9 datasets → -
Operating Systems
Operating system concepts, kernels, and process management.
5 datasets → -
Networking
Network protocols, models, and architecture.
7 datasets → -
Cybersecurity
Security principles, threats, and defensive practices.
6 datasets → -
Cloud Computing
Cloud service models, providers, and deployment patterns.
7 datasets → -
DevOps
DevOps practices, CI/CD, and infrastructure as code.
6 datasets → -
Mathematics
Core mathematical concepts, theorems, and notation.
7 datasets → -
Physics
Core physics concepts and laws.
6 datasets → -
Chemistry
Chemical elements, compounds, and reactions.
5 datasets → -
Biology
Fundamental concepts in biology: cell biology, genetics, evolution, and ecology.
6 datasets → -
Astronomy
Celestial objects, phenomena, and cosmology.
5 datasets → -
History
Major historical events, civilizations, eras, and turning points that shaped the modern world.
6 datasets → -
Geography
Countries, capitals, landforms, and climate.
5 datasets → -
Economics
Economic theories, indicators, and systems.
5 datasets → -
Philosophy
Major philosophical traditions, schools of thought, key thinkers, and fundamental questions.
6 datasets → -
Literature
Literary movements, genres, narrative techniques, and major works across history.
6 datasets → -
Linguistics
Language structure, phonetics, and semantics.
5 datasets → -
Psychology
Psychological concepts, disorders, and theories.
6 datasets → -
Law
Legal systems, terminology, and landmark cases.
5 datasets →
Every dataset
Grouped by category. Each link opens the data as a readable page.
HTTP Status Codes
- CORS (Cross-Origin Resource Sharing) Guide
- Complete HTTP Status Codes Reference
- HTTP Authentication Methods
- HTTP Caching: Complete Guide
- HTTP Client Error Status Codes (4xx)
- HTTP Content Negotiation
- HTTP Methods Reference
- HTTP Redirect Status Codes (3xx)
- HTTP Server Error Status Codes (5xx)
- HTTP Status Code Best Practices
Data Structures
- Advanced Graph Algorithms
- Concurrent Data Structures
- Data Structure Complexity Analysis
- Graph Algorithms
- Hash Tables & Hash Functions
- Probabilistic Data Structures: Bloom Filters & Beyond
- Sorting Algorithms Comparison
- Spatial Data Structures
- String Algorithms and Pattern Matching
- Tree Data Structures
AI & ML Terms
- AI Ethics & Interpretability
- Attention Mechanisms in Deep Learning
- Deep Learning Optimizers
- Large Language Model Glossary
- Machine Learning Evaluation Metrics
- Machine Learning Model Architectures
- Machine Learning Training Algorithms
- Neural Network Architectures
- Regularization Techniques in Machine Learning
- Transfer Learning and Fine-Tuning
Unix Commands
- AWK Reference
- Git Essential Commands
- Sed Reference
- Shell Scripting Guide (Bash)
- Unix File Operation Commands
- Unix Networking Commands (curl, wget, netstat, ss, nmap, dig, ping, traceroute)
- Unix Process & System Management Commands
- Unix Text Processing Commands (grep, sed, awk, cut, sort, uniq)
- Unix/Linux Package Management (apt, yum, dnf, brew, pacman)