Enhance the editorial interface and improve the processes and workflows around creating, editing or removing content.
Markdown syntax parser.
Unique content title module provides a facility to validate uniqueness of each node of specific content type.
This module provides the ability to show help text for each content type created on a site.
This module just exposes the group content administration to the users reproducing the Drupal core content management section.
When using the WYSIWYG module with CKEditor, this module lets you specify arbitrary CKEditor plugins that can be recognised by WYSIWYG.