Free Data sets for machine learning practice

There are many places data sets are available for free, I have collected following links over the periods, many of them for learning purpose, there are few for real serious for problem solving.

UCI have famous data repository at

Very good weather data at for at

Data set for different ML problems order in terms of complexity

If you have Wolfarm Alpha pro account, you can download research data in CSV format. For example (Hover your mouse on the plots to get download link)

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