I found this thanks to the APCS A mailing list.
The Collection of Really Great, Interesting, Situated Datasets
“The CORGIS Datasets Project seeks to make highly-motivating introductory computing experiences through simple, easy-to-pick-up datasets for beginners. We offer a wide range of libraries for many different programming languages and contexts. “
I haven’t looked at the libraries yet as they are for languages (Java, Python, and Racket) that I am not currently using but I would be if I were using them. There are also raw data sets in sql, JSON, and CSV formats. I use CSV files a lot and was very please with the look of the 43 data sets in that format. I can see some interesting projects ahead for my programming classes, data analysis in Advanced Placement Computer Science Principles, and even my freshmen course where we use EXCEL.
If you are interested in good data for real learning I recommend you take a look at https://think.cs.vt.edu/corgis/