You're looking for an SSO plugin or the Session Sharing plugin.
Ghost/Wordpress Article -> NodeBB post
I may be looking into making this myself at some point down the road but I have a lot of things going on that will slow me down. In case someone here can get to this (and probably have an easier time than I) faster than me, I wanted to share the idea. The most difficult aspect of this idea is I believe it will likely result in needing a plugin for both NodeBB and the blog engine.
I plan to host a Ghost CMS blog and use the NodeBB commenting engine plugin. What I want is the ability to post new blog post to Ghost CMS and have a NodeBB forum thread created. Ideally, this thread in NodeBB would be indicated with some kind of special badge showing that this post is really a link to the blog.
I think what I would probably like to do is also integrate the comment engine functionality into this plugin as the aim of this plugin is to try to unify these systems a little bit. My main goal is to give the blog the same interactivity a forum sees. The blog will act similar to a high-quality forum thread so I'd like the users to be able to interact the same way.
If no one here wants to tackle this, it will at least serve as a discussion to help guide me when I give it a shot.
- From Ghost CMS select that post will also create a NodeBB thread (select category)
- NodeBB will create a "symbolic" link to the blog post. A fake listing that links to the blog
- Enable voting on article (tied to the nodeBB votes system)