I started playing with a concept in Webflow last night with the drop-down widget.
This is made 100% in Webflow, if you put your mind to it, you can create anything in Webflow.
V1 (Menu in Upper Right Hand Corner): http://wb-navigation-concept.webflow.io/
Webflow Link (pssst, you can see how it's made here): https://webflow.com/website/Waldos-Navigation-Concept
V2 (Menu in Bottom Right Corner): http://waldos-new-nav.webflow.io/
Please let me know if you have any questions or comments