Knockout not considered "framework", just a lowly "library". Like jquery.

Frameworks are those that force their own opinion/style on your code structure and architecture.

But isn't React also a library rather than a framework by this measure? I think knockout is no longer in development so like Backbone it doesn't really merit inclusion.

That's news to me. The last release was just couple months ago.

Knockout is pretty much feature stable with most stuff in place, so it won't have as frequent releases as younger frameworks.

Interesting. Awhile ago it seemed it has a support from Microsoft.