A list of public data sources: 

Public Datasets

• Here is another collection https://github.com/awesomedata/awesome-public-datasets

• https://github.com/apiad/datasets-list

• https://github.com/datasets/openml-datasets/tree/master/data the same data as this list https://www.openml.org/search?type=data

• Machine Learning Data sets  https://archive.ics.uci.edu/

• https://www.data.gov/

• https://www.kaggle.com/datasets

• https://sites.google.com/a/drwren.com/wmd/details

• https://opendata.cityofnewyork.us/

• http://snap.stanford.edu/data/index.html

• Amazon AWS Public Dataset Program https://aws.amazon.com/opendata/public-datasets/ 

Event Data

• GeoLife GPS Trajectories http://research.microsoft.com/en-us/downloads/b16d359d-d164-469e-9fd4-daa38f2b2e13/

• Activity Recognition in the Home Setting Using Simple and Ubiquitous Sensors (MIT Project 2004) http://courses.media.mit.edu/2004fall/mas622j/04.projects/home/

• https://sites.google.com/a/drwren.com/wmd/home

Frequent Itemset Mining Dataset Repository

• http://fimi.ua.ac.be/data/

Airline On-time Performance

• http://www.eecs.wsu.edu/~yyao/StreamingGraphs.html

• http://openflights.org/data.html

Collection and Streaming of Graph Datasets

• http://www.eecs.wsu.edu/~yyao/StreamingGraphs.html

Data Streams

• http://www.quora.com/Where-can-I-find-public-or-free-real-time-or-streaming-data-sources

• 3 hourly weather forecast and observational data – UK locations http://data.gov.uk/dataset/metoffice_uklocs3hr_fc

• There is also an IRC chan with the live log of wikipedia edits on the #en.wikipedia channel of the irc.wikimedia.org server. http://blog.programmableweb.com/2010/12/26/64-new-apis-real-time-facebook-twitter-streaming-and-google-shopping/

New York Taxi Datasets

• https://data.ny.gov/

• TLC Trip Record Data http://www.nyc.gov/html/tlc/html/about/trip_record_data.shtml

• Another Taxi Data set (including GPS) published by chris whong http://chriswhong.com/open-data/foil_nyc_taxi/

• Another Description of this dataset http://publish.illinois.edu/dbwork/open-data/

OpenStreet Map

• http://wiki.openstreetmap.org/wiki/Planet.osm

Dublin Bus GPS sample data from Dublin City Council (Insight Project)

• https://data.gov.ie/dataset/dublin-bus-gps-sample-data-from-dublin-city-council-insight-project Further data set at https://data.gov.ie

Wikipedia Dump

• Wikpedia Dump https://dumps.wikimedia.org/