Based on HTML5 UP theme Solid State https://html5up.net/solid state/ .

Responsive menu based on HTML5 UP theme Phantom https://html5up.net/phantom/ .

A responsive navbar with company name and nested links. You can add multi level dropdowns, and it also has the option to add search. As is, the search is wired up to log a message to the console, but you can make it access an external service like Google or Algolia if desired. Based on the Shapely theme at https://colorlib.com/shapely .

An animated, colorful navbar section with transition between buttons. Based on a design by Mert Cukuren https://codepen.io/knyttneve/pen/LKrGBy

Based on Templated theme Intensify https://templated.co/intensify

Based on Templated theme Transitive https://templated.co/transitive

Simple responsive navbar with side menu. Based on Templated theme Binary https://templated.co/binary

Based on Templated theme Spatial https://templated.co/spatial

Image menu full page - Open-source, modular web software

Based on Templated theme Urban https://templated.co/urban

Based on Templated theme ExMachina https://templated.co/exmachina

Based on HTML5 UP theme Forty https://html5up.net/forty

Based on the Iridium theme from https://templated.co/iridium

Circles nav - Open-source, modular web software

Based on the Introspect theme from https://templated.co/introspect

Main above the fold content section with a navbar, background image, and side menu built in. Also has a prominent call to action button for guiding visitors.

Transparent fixed top navbar - Open-source, modular web software

Responsive Navbar with Logo - Open-source, modular web software

Fixed navbar - Open-source, modular web software

Fixed Navbar with Logo - Open-source, modular web software

Fixed Navbar with Logo (bottom) - Open-source, modular web software