The datasets used in Intro Stats 7e (De Veaux, Velleman, Bock) are publicly available at this GitHub site: 

https://introstats7e.github.io/

There are also a wide variety of data sources freely available from other organizations online. 

Health Sciences

• National Center for Health Statistics (Center for Disease Control)  - links to publications and data organized by disease or health outcome 

• CDC WONDER is a portal for accessing and working with CDC data

• World Health Organization data portal 

Social Science

• Gallup polls

• United Nations data (includes tourism, industry, education, environment, crime, population demographics, and more) 

• Social sciences data from the Inter-university Consortium for Political and Social Research (ICPSR) - the thematic collections can give you some ideas about topics and starting points. 

• College Scorecard data 

• data.gov: U.S. government open data 

• Gapminder tracks the U.N. development goals for countries around the world 

• IPUMS provides extracts of U.S. Census Bureau data. You will need to submit an online application describing your project and then wait a few days for approval before downloading data. 

House Prices 

• American Housing Survey 

Consumer Spending 

• Consumer Expenditure Survey, available from NBER (more user-friendly) or Bureau of Labor Statistics (BLS; complete data)

Climate Science

• Precipitation reports

• NOAA's historical climate and weather data

Sports 

• Baseball: The Guide to Sabermetric research from the Society for American Baseball Research recommends several data sources and explains what is available from each 

• Basketball: Kaggle NCAA data (requires a free account), data.world basketball datasets

Variety Databases

• Europa Open Data Portal -- data ranging from a grassland butterfly index, to housing construction prices, to social beliefs 

• Google's Public Data Explorer to locate and visualize publicly available data 

• The CMU dataset archive 

• UCI machine learning repository: https://archive.ics.uci.edu/ml/datasets.php

• Kaggle: https://www.kaggle.com/

• FiveThirtyEight (yes, it's a data visualization blog, but they also make much of their data public!): https://data.fivethirtyeight.com/ 

• GitHub: Awesome Public Datasets  https://github.com/awesomedata/awesome-public-datasets 

• Datasets from Buzzfeed News on Github https://github.com/BuzzFeedNews 

• All datasets available in R packages are listed at https://vincentarelbundock.github.io/Rdatasets/datasets.html.