Here is a list of free datasets available around the web.
Awesomedata on GitHub
Awesomedata keeps a list of mostly free datasets on GitHub for a variety of fields.
- Complementary Collections
Note that you may search for data directly on Google Dataset Search.
Some of these datasets are also available from GitHub.
They include a variety of datasets in multiple formats:
Google AI Datasets
Free datasets released by Google AI for multiple disciplines.