Data & AI Resource Directory
Find trustworthy places to get datasets, explore healthcare and imaging data, learn tools, build machine-learning projects, work with APIs, and strengthen data-engineering practice. Every entry includes a plain-language explanation so you can decide whether it is useful before opening another site.
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Data Discovery
Find general-purpose datasets for machine learning, analytics, and exploration.
Kaggle Datasets
Search thousands of community and organization datasets across tabular, image, text, time-series, and other formats.
Best for: Broad public datasets and project practice
Visit Kaggle Datasets ↗UCI Machine Learning Repository
A long-running UC Irvine repository of datasets widely used for machine-learning education and benchmarking.
Best for: Classic and research-oriented ML datasets
Visit UCI Machine Learning Repository ↗OpenML
An open platform for sharing datasets, machine-learning tasks, experiments, and benchmark results.
Best for: Reproducible datasets, tasks, runs, and benchmarks
Visit OpenML ↗Google Dataset Search
Google’s dataset-focused search engine for discovering data published across government, research, institutional, and public sites.
Best for: Finding datasets across many publishers
Visit Google Dataset Search ↗Hugging Face Datasets
Searchable community hub for machine-learning datasets with modality, format, language, license, and task filters.
Best for: NLP, vision, audio, multimodal, and generative-AI data
Visit Hugging Face Datasets ↗Registry of Open Data on AWS
AWS registry of openly available datasets that can be accessed for analysis, research, and cloud-scale workloads.
Best for: Large public datasets hosted in AWS
Visit Registry of Open Data on AWS ↗data.world
Data catalog and collaboration platform with public datasets, metadata, and community-curated collections.
Best for: Discovering and organizing shared datasets
Visit data.world ↗Nasdaq Data Link
The current Nasdaq destination for the service formerly known as Quandl, providing financial, economic, and alternative datasets.
Best for: Economic, market, and alternative data
Visit Nasdaq Data Link ↗DataHub
Platform for discovering, publishing, and working with structured datasets and reusable data packages.
Best for: Structured public data and data packages
Visit DataHub ↗Healthcare & Imaging
Trusted sources for medical imaging, physiologic signals, public health, and global health data.
The Cancer Imaging Archive (TCIA)
NCI-supported archive of de-identified cancer imaging collections, commonly distributed in DICOM with supporting clinical and analysis data when available.
Best for: Cancer CT, MRI, pathology, and related research data
Visit The Cancer Imaging Archive (TCIA) ↗PhysioNet
Research resource for complex physiologic signals and clinical datasets, with documentation, software, and data-use requirements.
Best for: ECG, ICU, waveform, and physiologic datasets
Visit PhysioNet ↗HealthData.gov
U.S. government health-data portal for datasets published by federal health agencies and programs.
Best for: Public U.S. health and human-services datasets
Visit HealthData.gov ↗CDC Data
CDC open-data portal for public-health indicators, surveillance datasets, and program data.
Best for: U.S. surveillance and public-health datasets
Visit CDC Data ↗WHO Data
World Health Organization data hub for global health statistics, indicators, observatories, and country-level health information.
Best for: International health indicators and estimates
Visit WHO Data ↗Institute for Health Metrics and Evaluation (IHME)
University of Washington institute providing Global Burden of Disease research, data tools, methods, and health-metrics resources.
Best for: Global Burden of Disease and comparative health metrics
Visit Institute for Health Metrics and Evaluation (IHME) ↗UNICEF Data
UNICEF statistics and evidence on children and women, including health, nutrition, education, protection, and demographic indicators.
Best for: Child, maternal, education, and development indicators
Visit UNICEF Data ↗Government & Global Data
Official national, international, economic, environmental, and city open-data portals.
Data.gov
Official U.S. government open-data catalog spanning health, climate, education, transportation, science, economics, and many other topics.
Best for: Cross-agency U.S. public datasets
Visit Data.gov ↗World Bank Open Data
World Bank access point for development indicators, country profiles, economic measures, and globally comparable public data.
Best for: Economic, social, and development indicators
Visit World Bank Open Data ↗UN Data
United Nations data portal aggregating official statistics across population, trade, environment, health, labor, education, and other domains.
Best for: UN statistical series across countries and topics
Visit UN Data ↗IMF Data
International Monetary Fund portal for economic, financial, fiscal, monetary, trade, and country-level statistical datasets.
Best for: Macroeconomic and financial statistics
Visit IMF Data ↗OECD Data Explorer
OECD’s current data-exploration platform for internationally comparable statistics across economies, society, education, health, environment, and policy.
Best for: Comparable economic and social indicators
Visit OECD Data Explorer ↗European Data Portal
Official European data portal for discovering datasets published by EU institutions, member states, and public bodies.
Best for: European Union public-sector datasets
Visit European Data Portal ↗UK National Data Library
UK government portal for finding public datasets and metadata published by departments, agencies, local authorities, and public bodies.
Best for: United Kingdom government datasets
Visit UK National Data Library ↗Government of Canada Open Data
Government of Canada open-data catalog with machine-readable datasets, metadata, downloadable formats, and API-enabled resources.
Best for: Federal Canadian datasets and APIs
Visit Government of Canada Open Data ↗U.S. Census Bureau Data
Official Census Bureau gateway to demographic, economic, population, geographic, survey, and visualization products.
Best for: U.S. population, housing, business, and geography
Visit U.S. Census Bureau Data ↗European Environment Agency Datahub
EEA hub for quality-assured environmental, climate, biodiversity, energy, and sustainability datasets from European reporting networks.
Best for: European climate, environment, and sustainability data
Visit European Environment Agency Datahub ↗London Datastore
Greater London Authority portal providing open datasets and data products about London’s people, economy, places, planning, and services.
Best for: London population, economy, planning, and city indicators
Visit London Datastore ↗Seattle Open Data
City of Seattle open-data catalog covering public safety, transportation, permits, services, geography, and municipal operations.
Best for: Municipal analytics and civic-data projects
Visit Seattle Open Data ↗Chicago Data Portal
City of Chicago portal for transportation, public safety, business, buildings, health, community, and city-service datasets.
Best for: Urban analytics and civic-data projects
Visit Chicago Data Portal ↗Austin Open Data
City of Austin portal for civic datasets including transportation, utilities, permits, public safety, environment, and city operations.
Best for: Local government and urban-data projects
Visit Austin Open Data ↗San Francisco Open Data
San Francisco’s public-data portal for city operations, housing, transportation, public safety, environment, business, and community indicators.
Best for: Civic analytics and public-sector projects
Visit San Francisco Open Data ↗Research, Science & APIs
Specialized research datasets and developer-facing APIs for scientific, economic, network, and real-time projects.
NASA Open Data
NASA’s open-data portal for datasets and metadata from scientific missions, research programs, engineering activities, and agency operations.
Best for: Space, Earth science, engineering, and mission data
Visit NASA Open Data ↗NOAA National Centers for Environmental Information
NOAA’s primary environmental data archive for climate, weather, oceans, coastal, geophysical, and related Earth-system datasets.
Best for: Weather, climate, ocean, and geophysical data
Visit NOAA National Centers for Environmental Information ↗Stanford SNAP
Stanford collection of large network datasets for social, communication, citation, web, collaboration, and graph-learning research.
Best for: Graph mining and network-analysis research
Visit Stanford SNAP ↗MovieLens
GroupLens movie-rating datasets widely used for recommender-system research, teaching, and experimentation.
Best for: Recommendation algorithms and collaborative filtering
Visit MovieLens ↗IMDb Non-Commercial Datasets
IMDb’s current non-commercial dataset distribution for title, person, rating, episode, and related entertainment metadata.
Best for: Movie and television metadata research
Visit IMDb Non-Commercial Datasets ↗Enron Email Dataset
Carnegie Mellon-hosted public Enron email corpus commonly used for NLP, information retrieval, and network-analysis research.
Best for: NLP, email classification, and communication networks
Visit Enron Email Dataset ↗OpenAlex
Open catalog of scholarly works, authors, institutions, concepts, sources, and citations designed for research and bibliometric analysis.
Best for: Research analytics and bibliometrics
Visit OpenAlex ↗GBIF
Global Biodiversity Information Facility providing open species-occurrence and biodiversity data from institutions around the world.
Best for: Ecology, species, and geospatial research
Visit GBIF ↗Federal Reserve Data Download Program
Federal Reserve Board tool for downloading official economic and financial time series in machine-readable formats.
Best for: U.S. financial and economic series
Visit Federal Reserve Data Download Program ↗NASA Open APIs
NASA developer APIs for astronomy, imagery, Earth observation, Mars, space weather, and other public agency datasets.
Best for: Space and Earth-science application prototypes
Visit NASA Open APIs ↗OpenWeather API
Developer APIs for current weather, forecasts, historical weather, geocoding, and related environmental data; plans and rate limits vary.
Best for: Weather, forecast, and geospatial application prototypes
Visit OpenWeather API ↗Alpha Vantage
API service for equities, foreign exchange, digital assets, technical indicators, and economic data; access tiers and limits apply.
Best for: Market-data prototypes and time-series exercises
Visit Alpha Vantage ↗U.S. Census APIs
Official Census developer catalog for programmatically querying ACS, Decennial Census, business, population, and other datasets.
Best for: Programmatic demographic and economic data access
Visit U.S. Census APIs ↗FRED API
Federal Reserve Bank of St. Louis API for programmatic access to FRED economic series, releases, categories, tags, and related metadata.
Best for: Macroeconomic time-series applications
Visit FRED API ↗Python & Machine Learning
Core official documentation for the Python data-science and machine-learning stack.
Python Documentation
Authoritative Python documentation including the tutorial, language reference, standard library, HOWTOs, setup guides, and packaging links.
Best for: Python language, standard library, setup, and references
Visit Python Documentation ↗Project Jupyter
Official Jupyter project site for notebook-based interactive computing, JupyterLab, JupyterHub, kernels, documentation, and related tools.
Best for: Notebooks, JupyterLab, and reproducible exploratory work
Visit Project Jupyter ↗NumPy Documentation
Official NumPy manual, user guide, API reference, tutorials, and release documentation for scientific Python computing.
Best for: Arrays, vectorized computation, linear algebra, and numerical workflows
Visit NumPy Documentation ↗pandas Documentation
Official pandas documentation for DataFrame operations, indexing, reshaping, time series, I/O, missing data, and analytical workflows.
Best for: Tabular data cleaning, transformation, joins, and analysis
Visit pandas Documentation ↗Matplotlib Documentation
Official Matplotlib documentation with plotting examples, API references, tutorials, and guidance for static and interactive visualization.
Best for: Publication-style and programmatic Python plotting
Visit Matplotlib Documentation ↗scikit-learn
Official scikit-learn documentation for supervised and unsupervised learning, preprocessing, metrics, model selection, inspection, and pipelines.
Best for: Classical ML, preprocessing, evaluation, pipelines, and model selection
Visit scikit-learn ↗PyTorch
Official PyTorch platform with documentation, tutorials, ecosystem libraries, distributed training guidance, and deployment resources.
Best for: Research, neural networks, GPU training, and production ML
Visit PyTorch ↗TensorFlow
Official TensorFlow site with guides, tutorials, APIs, Keras resources, deployment tooling, and ecosystem documentation.
Best for: Deep learning, deployment, edge/mobile, and production workflows
Visit TensorFlow ↗Hugging Face
Open AI platform hosting models, datasets, Spaces, libraries, documentation, and community resources across modern machine-learning tasks.
Best for: Models, datasets, transformers, diffusion, and open-source AI
Visit Hugging Face ↗XGBoost
Official XGBoost documentation for gradient-boosted tree models, Python APIs, distributed training, parameters, tutorials, and deployment guidance.
Best for: High-performance tree boosting on structured data
Visit XGBoost ↗Data Engineering & MLOps
Tools for data processing, orchestration, experiment tracking, versioning, and analytics engineering.
Apache Spark
Official Spark documentation for distributed batch and streaming processing, Spark SQL, DataFrames, MLlib, and cluster execution.
Best for: Large-scale ETL, analytics, SQL, streaming, and ML pipelines
Visit Apache Spark ↗DuckDB
In-process analytical database optimized for fast SQL analysis of Parquet, CSV, DataFrames, and local analytical workloads.
Best for: Local analytics, SQL on files, and embedded OLAP
Visit DuckDB ↗Polars
High-performance DataFrame library built around parallel execution, expression-based transformations, and efficient columnar data processing.
Best for: Fast DataFrame processing and lazy query execution
Visit Polars ↗MLflow
Open-source platform for tracking machine-learning experiments, managing models, evaluating runs, and organizing ML development workflows.
Best for: Experiment tracking, model packaging, evaluation, and lifecycle workflows
Visit MLflow ↗DVC
Data Version Control documentation for reproducible pipelines, dataset/model versioning, remote storage, experiment tracking, and Git-integrated ML workflows.
Best for: Versioning datasets, model artifacts, pipelines, and experiments
Visit DVC ↗Apache Airflow
Official Airflow documentation for authoring, scheduling, monitoring, and operating dependency-aware data and batch workflows.
Best for: Scheduling and monitoring data pipelines
Visit Apache Airflow ↗dbt Developer Hub
Official dbt documentation for modular SQL transformation, data testing, lineage, documentation, semantic modeling, and analytics-engineering practices.
Best for: SQL transformation, testing, documentation, and warehouse workflows
Visit dbt Developer Hub ↗Visualization & BI
Tools for charts, dashboards, exploratory visualization, and communication of data findings.
Plotly Python
Plotly’s Python graphing documentation for interactive statistical, scientific, financial, geographic, and custom visualizations.
Best for: Interactive Python charts and analytical dashboards
Visit Plotly Python ↗Observable
Browser-based environment for fast data exploration, reactive notebooks, visualization, and publishing interactive analytical work.
Best for: Interactive data analysis, prototyping, and web-native visualization
Visit Observable ↗Tableau Public
Free public Tableau platform for creating, sharing, and exploring interactive data visualizations and dashboards.
Best for: Publishing interactive dashboards and portfolio visualizations
Visit Tableau Public ↗Power BI Documentation
Microsoft Learn documentation for Power BI Desktop, service, modeling, DAX, visualization, administration, and enterprise BI workflows.
Best for: Power BI modeling, reports, dashboards, and governance
Visit Power BI Documentation ↗Datawrapper
Browser-based tool for creating responsive charts, maps, and tables designed for publishing and explanatory data communication.
Best for: Clear charts, maps, and tables for public communication
Visit Datawrapper ↗Learning, Practice & Community
Practical courses, challenges, and communities for building skills and getting technical help.
Google Machine Learning Crash Course
Google’s practical introductory course covering regression, classification, data preparation, neural networks, production ML systems, LLM basics, and fairness.
Best for: Practical machine-learning foundations and responsible ML
Visit Google Machine Learning Crash Course ↗Kaggle Learn
Free practical courses and guides designed to build usable skills through concise lessons, notebooks, exercises, and project-oriented topics.
Best for: Short hands-on courses in Python, ML, data, and AI
Visit Kaggle Learn ↗Hugging Face Learn
Hugging Face’s course hub covering large language models, agents, computer vision, audio, diffusion, reinforcement learning, and related open-source AI topics.
Best for: LLMs, agents, vision, audio, diffusion, and open-source AI
Visit Hugging Face Learn ↗fast.ai
Research and education community offering free practical deep-learning courses, software, documentation, and learning materials centered on accessible applied AI.
Best for: Practical deep learning for people with coding experience
Visit fast.ai ↗DataTalks.Club
Global data community offering free courses, events, articles, podcasts, Slack discussion, and peer learning for data and AI practitioners.
Best for: Data engineering, ML engineering, MLOps, AI, and career learning
Visit DataTalks.Club ↗Kaggle Competitions
Machine-learning competitions and community challenges where users can practice modeling, compare approaches, and learn from public solutions and discussions.
Best for: Applied ML practice and benchmark-style competitions
Visit Kaggle Competitions ↗Cross Validated
Stack Exchange community focused on statistics, machine learning, probability, experimental design, inference, and analytical methodology.
Best for: Statistics, probability, methodology, and ML theory questions
Visit Cross Validated ↗Stack Overflow
Large programming Q&A community useful for targeted implementation, library, language, tooling, and debugging questions when searched critically.
Best for: Debugging and implementation questions
Visit Stack Overflow ↗What changed in the August 2026 resource review?
- Duplicate entries and malformed legacy list markup were removed.
- Quandl was updated to its current destination, Nasdaq Data Link.
- OECD.Stat was replaced with the current OECD Data Explorer.
- The legacy European Data Portal destination was updated to data.europa.eu.
- NOAA’s older NCDC destination was replaced with the current National Centers for Environmental Information (NCEI).
- The old IMDb interfaces URL was updated to IMDb’s current Non-Commercial Datasets page.
- Older destinations that are archived, repurposed, unreliable, or no longer strong recommendations were retired from this directory rather than presented as current resources. Examples include the legacy mldata.org repository, old TunedIT links, the old COVID19API listing, and Zanran’s former numerical-data search use case.