Modules for Backdrop CMS

This module provides flexible voting widgets for nodes and comments.
Administrators can add multiple widgets and define an unlimited number of
buttons.

This functionality is in core as of Backdrop 1.20.3. Details here.

Menu Firstchild enables you to create a parent item, without any path, that
links to its first viewable child item.

This module aims to help site administrators follow the guidelines of
the "General Data Protection Regulation" (GDPR) regarding user
tracking and integration of third party content.

Maillog / Mail Developer

Provides a select box form element with an additional option 'Other' and the
ability for the user to provide a new response in a displayed textfield.

Language Switcher Dropdown enhances the core Language Switcher block by
displaying it as a dropdown menu. It also adds block settings that let you:

This module provides a site map that gives visitors an overview of your site.

It can also display the RSS feeds that are automatically generated by Backdrop
for things like taxonomy terms, books, and blogs.