Modules for Backdrop CMS

Provides the authmap table and functions removed from from Drupal 8.x and
inherited by Backdrop Core. This module is often used with other modules
providing Single Sign-On (SSO).

Enhanced Number Display Options (endo) enables you to precisely define the
display format of number fields.

Provides a views filter that sorts node titles by a more natural manner by ignoring articles like "A" "An" and "The."

Normal sort:

A Chorus Line

Other View Filter enables you to filter the contents of one view by the
contents of another view. You can either filter by items that exist in the
other view or filter by items that do not exist in the other view.

Field Readonly displays non-accessible fields in edit forms as read-only items.

Modules like the essential Field Permissions allow to make fields non-accessible by completely hiding them in edit forms even if user has the permission to view them.

About

The Duplicate Images module allows you to find and remove duplicate images
and other documents on the public or private file system.

Adds the ability for inline form errors. The error messages will appear next to the relevant field with the error, in addition to the message at the top of the form. This improves usability and accessibility.

A module that enables embedding drupal blocks in CKEditor. It currently uses the
insert_block module to render the blocks but this functionality may be moved
into the module to reduce dependencies.

Simplenews Content Selection allows you to select already created content to
assemble in the body of a newsletter (provided by the Simplenews module)
content type.

Provides two helper widgets for the Field API: