The itslearning Library allows teachers - and if optionally students - to search for content, that can either be added to their personal collection or to a course. Teachers can also share content with others via the Library.
With the proprietary Organisation API it is possible to automatically add resources to the itslearning Library. Since content providers usually want to keep the content on their side, this content can be added as regular link, but it is also possible to 'wrap' this link in an LTI to have better control over who can access the content.