Ask HN: Interesting Datasets/Datasources?

[drones]

I'm about to participate in a Code Jam themed around Datascraping and APIs. Looking for some interesting datasets, and general project ideas.

Info: The competition will go for 5 days. I'll be in a group of ¬3 of junior-levels devs of above average competency.

[h2odragon]

https://www.census.gov/econ/overview/go1200.html

Federal Government's "check register": what they spent, where. goes back to the 1980s.

[Tomte]

https://www.data-is-plural.com/archive/