Data

Here are some sources of freely available data that might be interesting to use in undergraduate or graduate courses.  I've mostly been focusing on compiling data sources that I have used, or would like to use, in math, applied math, operations research, statistics, or data analysis courses.

If you have any other good ideas, leave them in the comments section below and I'll add them!


Sports
Retrosheet.org
Fangraphs
Baseball Prospectus
Baseball-Reference.com
Basketball-Reference.com
Hockey-Reference.com

Government sites with data
NOAA - http://www.ncdc.noaa.gov/oa/mpp/freedata.html#FREE
CDC - http://www.cdc.gov/DataStatistics/
Data.gov - http://www.data.gov/   or  https://explore.data.gov/catalog/next-gen
US Energy Information Administration  - http://www.eia.gov/
Listing of Data from Various Gov't sources - http://gsociology.icaap.org/data.htm
Open Payments Data (Pharm company payments to doctors) - http://www.cms.gov/OpenPayments/Explore-the-Data/Dataset-Downloads.html

Graphs and Networks
Stanford SNAP - http://snap.stanford.edu/data/index.html
Mark Newman - http://www-personal.umich.edu/~mejn/netdata/
UCINET - http://vlado.fmf.uni-lj.si/pub/networks/data/UciNet/UciData.htm
The University of Florida Sparse Matrix Collection - http://www.cise.ufl.edu/research/sparse/matrices/


Other 
rOpenSci - http://ropensci.org/related/ - R packages for scraping data from various sources on the web
Gapminder - http://www.gapminder.org/data/
The International Disaster Database - http://www.emdat.be/database
Weather  http://history.weatherdb.com/
               http://climate.psu.edu/data/ida/index.php?t=3&x=faa_raw&id=KPNE
Gulf Science Data, released by BP - http://gulfsciencedata.bp.com/
Yelp Data sets 1. http://www.yelp.com/dataset_challenge/ 
                          2. https://www.yelp.com/academic_dataset