1
Add to the list the Github repo Awesomedata/awesome-public-datasets
(and also check out the Complementary Collections section, which links other lists/resources.)
At the time of this answer, the categories are:
Agriculture
Biology
Climate+Weather
ComplexNetworks
ComputerNetworks
DataChallenges
EarthScience
Economics
Education
Energy
Finance
GIS
Government
...
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