I am looking for a nexus-compliant repository where I can get a node installer (a nexus-compliant alternative to http://nodejs.org/dist/.
Context :
I would suggest to create a pull request/patch for the frontend plugin that allows you to add a full url for npm and node rather than just the version and the root url. Then you can host the two installed e.g. by uploading them to Nexus into a Maven 2 repository and using that URL. I filed an issue for that btw. https://github.com/eirslett/frontend-maven-plugin/issues/126
Alternatively could try to create a site repository in Nexus with the same structure and use that.