Amazon Web Services (AWS) datasets: https://registry.opendata.aws/
Awesome Public Datasets: https://github.com/awesomedata/awesome-public-datasets
BigQuery Public Datasets: https://cloud.google.com/bigquery/public-data/
Bureau of Labor Statistics: https://www.bls.gov/data/
Eurostat: open data from the EU statistical office: https://ec.europa.eu/eurostat/data/database
Google Dataset Search: https://datasetsearch.research.google.com/
Harvard Dataverse: https://dataverse.harvard.edu/
Kaggle Datasets: https://www.kaggle.com/datasets
Large Health Data Sets: https://www.ehdp.com/links/datasets.htm
UC Irvine Machine Learning Repository: http://archive.ics.uci.edu/ml/index.php
U.S. Government open data: https://www.data.gov/
World Bank Open Data: https://data.worldbank.org/