The People Group dashboard, powered by peoplegroups.org and now accessible via the Research Tab in GAPP, allows you to explore people groups around the world by filtering on various data points such as engagement status, religion, country, language, etc. Specific people group information from peoplegroups.org is included for each people group as well.
All data panels are interactive. If you click on, for instance, the country of Nigeria in the “Country” data panel, all of the data on the page filters for the country of Nigeria, including the people group list and indicators. Once filtered, a list of all of the people groups and their associated metrics can be downloaded by clicking the download button 
in the lower left of the People Group panel.
Similarly, you can use the filters at the top of the page to filter your data by single or multiple selections, updating in context the entire dashboard's information.
For more information and a tutorial on how to use filters, see the video below: