In this project found by @Ryuno-Ki a user study for a Github UI extension is shown, where end-users can be more closely involved with the software development process. The UI design allows end-users to be really part of the project and interact on a new interface tab called Project Design.
Here are some of the design mockups:
Sidebar that has place for listing end-user groups and contributors list:
The Project Design tab where a list of user interviews are tracked as discussions: