UCI Machine learning Repository
They currently maintain 622 data sets as a service to the machine learning community. You may view all data sets through our searchable interface.
Kaggle
Inside Kaggle you’ll find all the code & data you need to do your data science work. Use over 50,000 public datasets and 400,000 public notebooks to conquer any analysis in no time.
AWS Opendata
Inside Kaggle you’ll find all the code & data you need to do your data science work. Use over 50,000 public datasets and 400,000 public notebooks to conquer any analysis in no time.
Google datasets search