@openhab-ui/setup-and-maintenance/contexthelp/addon_repositories.md

Configuration and maintenance interface for openHAB

Online repositories are the source for openHAB to find and install
more add-ons. Some repositories are packaged with your distribution
and cannot be changed, only enabled/disabled.

You can add more maven repositories here.
This is usually required if a developer of a binding wants you to test
his binding.