kimcoleman

<?php
/**
 * Add column to show all posts a reusable block is used in.
 */
function my_reusable_blocks_screen_add_column( $columns ) {
	$columns['posts_used_in'] = esc_html__( 'Used In', 'textdomain' );
	return $columns;
}
add_filter( 'manage_wp_block_posts_columns', 'my_reusable_blocks_screen_add_column' );

georgestephanis

<?php

/**
 * Plugin Name: Reusable Block Count
 * Description: Display a "Reusable blocks" listing page, and a link to view all posts containing a given block.
 * Author: georgestephanis
 * Author URI: http://wpspecialprojects.wordpress.com/
 * License: GPLv2+
 *
 * Loosely based on https://github.com/yeswework/fabrica-reusable-block-instances/

seebz

<?php
/**
 * Plugin Name:	Reusable Blocks Extended
 * Plugin URI:	https://jeanbaptisteaudras.com/en/2019/09/reusable-block-extended-a-cool-wordpress-plugin-to-extend-gutenberg-reusable-block-feature/
 * Description:	Extend Gutenberg Reusable Blocks feature with a complete admin panel, widgets, shortcodes and PHP functions.
 * Version:		0.7-patch
 * Author:		audrasjb
 * Author URI:	https://jeanbaptisteaudras.com/en
 * License:		GPL-2.0+
 * License URI:	http://www.gnu.org/licenses/gpl-2.0.txt