Data Libraries

Search Engines

• Wolfram|Alpha
• Social Science Data Search Google Custom Search Engine @ Berkeley Library (targets 800+ academic, government agency, non-profit, and other web sites that provide high quality, downloadable statistical information and data sets. Emphasis is on data pertaining to the social sciences, health, developing countries, energy, natural resources, and the environment)

Misc

• Visual Analytics Benchmark Repository
• UCI Machine Learning Repository
• UCI KDD Archive UCI Knowledge Discovery in Databases Archive
• UW XML Repository University of Washington XML Data Repository
• StatLib Data, Software and News from the Statistics Community
• Time Series Analysis and Its Applications Book Example Data
• Time Series Data Library
• TimeWeb Web-based time series databanks
• PKDD 2000 Challenge Challenges of European Conferences on Principles and Practice of Knowledge Discovery in Databases
• PhysioNet the research resource for complex physiologic signals
• MatrixMarket A visual repository of test data for use in comparative studies of algorithms for numerical linear algebra, featuring nearly 500 sparse matrices from a variety of applications, as well as matrix generation tools and services.
• LifeLine project Visualising Migrations, Transitions and Trajectories
• 10x10 Every hour, 10x10 gathers the 100 most important words and pictures in the world, based on what's happening in the news.
• InfoVis Cyberinfrastructure Data Bases
• Enron Email Dataset
• Historical Stock Data Historical Data for S&P 500 Stocks
• Ensembl Provides sequence databases of gene, transcript and protein predictions.
• EPA air quality AirData Web site gives you access to air pollution data for the entire United States.
• Network intrusion dataset
• Internet Backbone Data Internet Mapping Project
• UCR Time Series Data Mining Archive A resource for researchers interested in the clustering, classification, indexing, segmentation, change point detection and rule extraction of time series. (by Eamonn Keogh)
• Deutsche Bundesbank Zeitreihen
• Source data sources of the Worldmapper project (Worldmapper project)
• Worldbank Development Data & Statistics
• Business Intelligence Network 2006 Data Visualization Competition (Excel spreadsheet)
• Timeseries by Eamonn Keogh et al.
• U.S. Department of Labor Bureau of Labor Statistics
• National Atlas
• UK Air Quality Archive Air Quality data in the UK from the present back to 1960
• Mitsubishi Electric Research Labs (MERL) Motion sensor data from a network of over 200 sensors for a year (WMD 2007).
• European Road Safety Observatory Road Safety Data
• CARE Community database on road accidents resulting in death or injury (EU)
• IRTAD international database that gathers data on traffic and road accidents from 28 out of the 30 OECD Member countries
• Trends Online A Compendium of Data on Global Change
• Finder! Finder is a browser-based application for finding, organizing and sharing GeoData in common formats.
• ICWSM 2009 Data Challenge data set containing 44 million blog posts; suitable for link analysis, social network extraction, analysis of influence among bloggers, ...
• CKAN Comprehensive Knowledge Archive Network
• Numbrary Numbrary is a free online service dedicated to finding, using and sharing numbers on the web.
• Infochimps Free Redistributable Rich Data Sets
• CISL Research Data Archive CISL Research Data Archive (RDA) - large and diverse collection of meteorological and oceanographic observations, operational and reanalysis model outputs, and remote sensing datasets
• CISL Research Data Archive CISL Research Data Archive (RDA) dataset selection according to variables, time resolution, etc.
• pachube a service that enables you to connect, tag and share real time sensor data from objects, devices, buildings and environments around the world.
• The World Bank Open Data
• Google Public Data Explorer
• Facebook social graph, weighted random walks, and applications Representative sample of Facebook users, weighted sample of college Facebook users and full sample of Facebook applications over a period of ~6 months.
• StatBank Denmark StatBank Denmark contains detailed statistical information on the Danish society. The database is free of charge and data can be exported in several file formats and presented as diagrams or maps.
• 3TU.Datacentrum offers the knowledge, experience and the tools to archive research data in a standardized, secure and well-documented manner.
• Jigsaw Datafiles
• American Statistical Association (ASA) Bi-Annual Data Exposition
• Data and Story Library (DASL) An online library of data files and stories that illustrate the use of basic statistics methods, from Carnegie Mellon
• Berkeley Data Lab
• UCLA Statistics Data Sets
• Freebase A community effort that mostly provides data on people, places, and things.
• Aggdata repository of for-sale datasets, mostly focused on comprehensive lists of retail locations.
• Amazon Public Data Sets
• GitHub Archive GitHub's public timeline is a huge time-oriented data source (e.g. commits to hosted open source projects)
• Correlates of War All wars in a CSV file.

Medicine

• PhysioNet/Computing in Cardiology Challenges
• OpenMRS Demo Data

Geography

(based on a list in Nathan Yau's book "Visualize This")

• TIGER From the Census Bureau, probably the most extensive detailed data about roads, railroads, rivers, and ZIP codes you can find.
• OpenStreetMap
• GeoCommons Both data and a mapmaker

World

(based on a list in Nathan Yau's book "Visualize This")

• Global Health Facts Health-related data about countries in the world.
• UNdata Aggregator of world data from a variety of sources.
• World Health Organization Again, a variety of health-related datasets such as mortality and life expectancy.
• OECD Statistics Major source for economic indicators.
• World Bank Data for hundreds of indicators and developer-friendly.

Open Government Data / Government and Politics

Austria

• Open Government Data Austria
• Collection of Open Data in Austria
• DataMarket.com is a data portal that provides access to statistics and structured data from various public and private sector organizations.
• Offene Daten Österreich
• data.umweltbundesamt.at Environment Agency Austria

UK

• Data.gov.uk Catalog for data supplied by government organizations.

USA

• Census Bureau extensive demographics.
• Data.gov Catalog for data supplied by government organizations.
• DataSF Data specific to San Francisco.
• NYC Data specific to New York.
• Follow the Money Big set of tools and datasets to investigate money in state politics.
• OpenSecrets provides details on government spending and lobbying.

InfoVis Contest Datasets

• InfoVis 2003 Contest Tree data
• InfoVis 2004 Contest Meta Data of publications
• InfoVis 2005 Contest Technology Trends in the United States
• InfoVis 2006 Contest 1% public use microdata sample from the 2002 Census
• InfoVis 2007 Contest Movie Database
• InfoVis 2008 Contest MERL motion sensor data

BioVis Contest Datasets

• BioVis 2013 Contest Protein Mutations and their effect on Protein Function

Other Lists

• Jeff Klingner's List of Online Databases

Tools for Creating Synthetic Datasets

• PCDC - On the Highway to Data A Tool for the Fast Generation of Large Synthetic Data Sets (by TU Darmstadt)