Content editing experience

GLightbox is a pure javascript lightbox. It can display images, iframes, inline content and videos with optional autoplay for YouTube, Vimeo and even self-hosted videos:
https://biati-digital.github.io/glightbox/

Validates content entities.

The Webform Submission Control module limits webform submission to entities. It includes a configuration form to set which webforms should prevent submission when not attached to an entity.

Extra Block Types: Counter module provides ability to add Number Counter and Text with WYSIWYG editor.

A simpler paragraphs selection plugin.

This module provides a field widget "Allowed Text Format" that allows to restrict the list of
editor formats for a formatted text field.