boomstik

This is a simple plugin which creates a [lorem-ipsum] shortcode that can be used to add an arbitrary number of Lorem Ipsum paragraphs (default 2), each one of arbitrary length (default 40 words). There are some plugins out there which create dummy content (posts/pages) filled with Lorem Ipsum, but this one just allows one to insert Lorem Ipsum into existing content, wherever shortcodes are accepted. I developed this to help place chunks of text into my test posts during theme development.
Maximum length of each paragraph and the number of paragraphs can be specified in the shortcode.
Features like paragraph length randomization and text start offset are supported but are not yet implemented in the admin interface. Currently, the length of each passage is randomized to 1/3 of the specified maximum paragraph length (e.g. for a 60-word paragraph, the actual generated length could be anywhere from 60 to 80 words). Each paragraph will also start at a different point in the text.
Usage: 
The shortcode takes the “p” and “wmax” parameters. “p” sets the number of generated paragraphs, and “wmax” sets the maximum length, in words, of each paragraph. Note that this value is used to set the actual max length, which can vary up to wmax+wmax/3.
If called without parameters, [lorem-ipsum] will create 2 paragraphs of 60 to 80 words each.
Examples: 
* [lorem-ipsum] 
* [lorem-ipsum p=6] 
* [lorem-ipsum wmax=100] 
* [lorem-ipsum p=9 wmax=21]

Just Add Lipsum

Creates a [lorem-ipsum] shortcode which can be used to add Lorem Ipsum text to any field which accepts shortcodes.

Felix Arntz

Introduces a simple method for defining block areas to use the block editor outside of the post content.
This is an experimental plugin that explores basic usage of Gutenberg blocks outside of the content bubble, on a sitewide level.
In the long term it will likely eliminate itself once WordPress core and Gutenberg will have completed the next phase of advancing to the sitewide level. The plugin exists as a baseline to have an easy way for experimenting with similar functionality already today.
<h4>Usage</h4>
After activating the plugin, you can create and edit block areas under Appearance > Block Areas. There should be two block areas already, <code>header</code> and <code>footer</code>.
Block areas are identified by their unique slug. Since <code>header</code> and <code>footer</code> are expected to exist, make sure not to delete them.
In order to print a specific block area, for example in your theme, use <code>block_areas()->render( $slug )</code> (e.g. <code>block_areas()->render( 'header' )</code>).
You can also explicitly add theme support, specifying which block area slugs your theme relies on (e.g. <code>add_theme_support( 'block-areas', 'header', 'footer' )</code>).

Block Areas

Great idea and reliable plugin, which we use to allow our clients to edit areas  using Gutenberg outside of the main content area.

Very simple yet very powerful

Introduces a simple method for defining block areas to use the block editor outside of the post content.

Just Add Lipsum vs Block Areas