Skimmed through the repos and it looks #OER related. #OER is mostly about the license. Is it a Creative Commons License like CC-0 CC-BY or CC-SA and has to do with education? You might call it #OER.
What might be of interest for you could be https://oersi.org/
It's an index of OER and they work internationally.
And you see the used metadata here https://oersi.org/resources/aHR0cHM6Ly9vY3cubWl0LmVkdS9jb3Vyc2VzLzktMTMtdGhlLWh1bWFuLWJyYWluLXNwcmluZy0yMDE5L3Jlc291cmNlcy9sZWN0dXJlLTctY2F0ZWdvcnktc2VsZWN0aXZpdHktY29udHJvdmVyc2llcy1hbmQtbXZwYS8=?format=json
I sketched out a nip to use this metadata profile as a nip here:
https://github.com/edufeed-org/nips/blob/edufeed-amb/edufeed.md
And a relay that understands that and uses the data for indexing it into a search engine https://github.com/edufeed-org/amb-relay
The metadata for these educational materials is based on this Schema (currently only German): https://w3id.org/kim/amb/latest/