Kaggle is an online community for data scientists owned by Google. While it offers a large variety of services, such as model building capabilities in a web-based environment, collaboration opportunities with other data scientists and competitions to test your data scienc accumen, one of it's biggest draws is the large number of free, relatively clean, datasets available for download.
For People Analytics topics specifically, some of the relevant datasets include:
- IBM's HR focused dataset of employee attrition and performance:
- Data on employee happiness and job turnover
And many more! Kaggle is a great resource to find free data for projects. If you're looking for people analytics specific projects, I recommend going to Kaggle and searching on their datasets page for "employee".