Robin Phillips

This plugin was originally written for a client, but may be useful for others. It simply creates a discrete banner when viewed on mobile. This banner can include a link, to a mailing list for example.

Mobile Banner

Create a banner with a link at the bottom of the screen, when viewed on mobile only.

Adrian Emil Tudorache

Responsive menu based on the Sidr jQuery plugin developed by BERRIART. It features an options panel where the menu can be configured. You can choose between sliding from the left or from the right side of the page, to have a full width bar or a simple button as the menu trigger and more. The menu features two CSS themes: dark and light.
It also adds two sidebars in Appearance -> Widgets, where you can add widgets before and after the menu.

Mobile Banner vs Sidr Responsive Menu