jdlessley wrote:I doubt that there are any remaining fully volunteer development teams since Windows LDS Tools was terminated in 2016. There are volunteers that help with development efforts on a small number of apps but those apps are managed primarily by church app managers.
Correct, there are three external apps I'm aware of that continue to be developed by volunteers: Gospel Library for Windows, Sacred Music for iOS, and Sacred Music for Android. However, at least one of the volunteers on each of those teams is also a Church employee, who can make sure the apps are following Church standards/guidelines; and none of those apps use APIs that access membership or other sensitive data.
The Church has an obligation to make sure that privacy laws (which vary by country) are followed when it comes to how various pieces of membership data are handled, from birth dates to full names to temple recommend status. It would be hard to make sure that happens if there were a public API available. I don't know of any other large organizations that allow you to export or access membership data using a public API.