28 Free Datasets collections
I made this list for me but also for those who indent to make an Dataset research, Analyse Data and print a 2D or 3D Graph. I think Dataset research it's already or would be somehow someday a "must have" knowledge for future generations, because we have so much public data collected and this amount of data will increase exponentially... already happening.
International Human Development Indicators - UNDP
http://hdrstats.undp.org/en/tables/default.html
Climate Research Unit
http://www.ipcc-data.org/obs/cru_ts2_1.html
An International Journal on the Teaching and Learning of Statistics
http://www.amstat.org/publications/jse/jse_data_archive.htm
Datasets causeweb.org
http://www.causeweb.org/cwis/SPT--BrowseResources.php?ParentId=5
Datasets statsci.org
http://www.statsci.org/datasets.html
A Handbook of Small Data Sets
http://www.stat.ncsu.edu/working_groups/sas/sicl/data/
Education Data and Tools
http://www.data.gov/education/community/education/datasets
Raw Data
https://explore.data.gov/catalog/raw
Research Datasets and Analytical Tools
http://econ.worldbank.org/WBSITE/EXTERNAL/EXTDEC/EXTRESEARCH/0,,contentMDK:20388241~menuPK:665266~pagePK:64165401~piPK:64165026~theSitePK:469382,00.html
Baseball-DataBank.org
http://www.baseball-databank.org/
Last.fm dataset 360K Music Recommendation Datasets for Research
http://mtg.upf.edu/node/1671
http://www.dtic.upf.edu/~ocelma/MusicRecommendationDataset/lastfm-360K.html
Sampling Online Social Networks
http://odysseas.calit2.uci.edu/doku.php/public:online_social_networks#facebook_geosocialmap
http://odysseas.calit2.uci.edu/doku.php/public:online_social_networks
What is Twitter, a Social Network or a News Media?
http://an.kaist.ac.kr/traces/WWW2010.html
Collections of data sets, databases and statistics for download - Infochimps
http://www.infochimps.com/collections
the Datahub The easy way to get, use and share data
http://datahub.io/
Spatial Data Download
http://www.canri.nsw.gov.au/download/
Stanford Large Network Dataset Collection
http://snap.stanford.edu/data/index.html#socnets
Klimaatdata enadvies Antieke reeksen: Stadswaterkantoor Amsterdam
http://www.knmi.nl/klimatologie/stadswaterkantoor/uitleg.html
Zillow Neighborhood Boundaries
http://www.zillow.com/howto/api/neighborhood-boundaries.htm
Airports datasets
http://www.ourairports.com/data/
UnData datasets
http://data.un.org/
data.gov.be datasets
http://data.gov.be/datasets
GeoNames geographical database covers all countries
http://www.geonames.org/
http://download.geonames.org/export/zip/
Use the catalog below to access U.S. Federal Executive Branch datasets.
https://explore.data.gov/catalog/raw
Datasets for Data Mining
http://www.kdnuggets.com/datasets/
Sampling Online Social Networks
http://konect.uni-koblenz.de/networks/facebook-sg
Dataset of the all-time top 1,000 posts, from the top 2,500 subreddits by subscribers
https://github.com/umbrae/reddit-top-2.5-million
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Related collection:
Where to Find Open Data on the Web
http://readwrite.com/2008/04/09/where_to_find_open_data_on_the
Publicdata datasets on delicious
https://delicious.com/tag/publicdata