Modules for Backdrop CMS

Provides a field for entities (nodes, users, taxonomies, comments, etc.) to
which a collection or group of any number of fields can be included and treated
as a whole or single unit.

The Entity Reference Autofill module provides an option for Entity Reference
fields to populate other fields in the entity form with values from a referenced
entity's field.

This module simply removed the CSS from your site on April 9th so you can
participate in the CSS Naked day to promote web standards.

Get more information at https://css-naked-day.org/

Mailgun module provides integration with the Mailgun
email service. The module uses Mailgun's official SDK for PHP.

This module adds the ability to specify attributes for individual options
on Bacdrop CMS Form API elements of the types select, checkboxes, and radios.

This module makes it possible to alter (change values of) fields on a node when leaving a comment.

This module will allow you to selectively delete watchdog entries based on
criteria, like age.

Drupal normally only deletes watchdog entries after 1,000 to 1,000,000 entries.

Backdrop matches only full URLs when creating SEO-friendly aliases. This module
extends that behavior by also matching known sub-paths and replacing them with
their respective alias.

This module is a work in progress that modifies the core revision handling to include
draft workflow, or the abililty to create an unpublished draft version of content that
has already been published.

Content Export Import

Integrates the htmx library in Backdrop.

htmx is a library that allows you to access modern browser features directly
from HTML, rather than using javascript.

From the htmx website:

Configuration of the text format extended for Editors