Where did Meta Box come from?

I've attached a screen shot of the page I see when I click Dashboard under Plugins. (Oops -- don't see a way to attach the screen shot. I've emailed it in reply to the email I received.)

Here is the list of plugins. I've put [IN] in front of the ones that aren't active.

Ad Inserter Pro by Ad Inserter Pro.
Admin Columns Pro by AdminColumns.com.
[IN] Admin Columns Pro - Advanced Custom Fields (ACF) by AdminColumns.com.
[IN] Admin Columns Pro - Yoast SEO by AdminColumns.com.
Admin Menu Editor Pro by Janis Elsts.
[IN] Advanced Custom Fields by Elliot Condon.
[IN] Advanced Custom Fields: Extended by ACF Extended.
Advanced Database Cleaner PRO by Younes JFR..
[IN] Advanced Editor Tools (previously TinyMCE Advanced) by Automattic.
Akismet Anti-Spam by Automattic.
BillTrack50 Scorecard by Revive Design Studios.
Boxzilla by ibericode.
Boxzilla - MailChimp integration by ibericode.
Boxzilla - Theme Pack by ibericode.
Classic Editor by WordPress Contributors.
Clicky Analytics by Alin Marcu.
[IN] CongressLookup by Constructive Growth LLC.
Cookie Notice by dFactory.
CoSchedule by CoSchedule.
Countdown builder by Adam Skaat.
Custom Related Posts by Bootstrapped Ventures.
Data Tables Generator by Supsystic by supsystic.com.
Data Tables Generator PRO by Supsystic by supsystic.com.
[IN] Duplicate Menu by Jonathan Christopher.
[IN] Enable jQuery Migrate Helper by The WordPress Team.
[IN] Enable Media Replace by ShortPixel.
[IN] Enhanced Media Library PRO by wpUXsolutions.
EventON by AshanJay.
EventON - Action User by Ashan Jay.
[IN] FacetWP by FacetWP, LLC.
ForwardKY Custom Functions by Webmaster.
iframe by webvitaly.
[IN] Insert Headers and Footers by WPBeginner.
Leaky Paywall by ZEEN101.
Leaky Paywall - Conditional Display Notice by Zeen101 Development Team.
Leaky Paywall - Gift Subscriptions by ZEEN101.
Leaky Paywall - Insights by ZEEN101.
Leaky Paywall - Login Redirect by ZEEN101.
Leaky Paywall - MailChimp by ZEEN101.
Leaky Paywall - Multiple Levels by Zeen101 Development Team.
Leaky Paywall - Recurring Payments by ZEEN101.
Leaky Paywall - Registration Redirect by ZEEN101.
Leaky Paywall - Reporting Tool by ZEEN101.
MC4WP: Mailchimp for WordPress by ibericode.
MC4WP: Mailchimp for WordPress Premium by ibericode.
Members by MemberPress.
Molongui Authorship by Amitzy.
Molongui Authorship Pro by Amitzy.
[IN] Perfmatters by forgemedia.
[IN] Play.ht by Play.ht.
Plugins List by David Artiss.
Print, PDF & Email by PrintFriendly by Print, PDF, & Email by PrintFriendly.
Public Post Preview by Dominik Schilling.
[IN] Query Monitor by John Blackbourn.
[IN] Regenerate Thumbnails by Alex Mills (Viper007Bond).
[IN] Regenerate Thumbnails Advanced by ShortPixel.
SG Optimizer by SiteGround.
[IN] Simple Tags by WebFactory Ltd.
snip pro - Structured Data Plugin by floriansimeth.
Social Warfare by Warfare Plugins.
Social Warfare - Pro by Warfare Plugins.
Stencil for WordPress by Stencil.
Sucuri Security - Auditing, Malware Scanner and Hardening by Sucuri Inc..
[IN] Syntax Highlighter for Post/Page HTML Editor by Space X-Chimp.
tagDiv Cloud Library by tagDiv.
tagDiv Composer by tagDiv.
[IN] tagDiv Mobile Theme by tagDiv.
tagDiv Standard Pack by tagDiv.
[IN] Tag Groups by Chatty Mango.
Term Management Tools by theMikeD, scribu.
[IN] Thrive Architect by Thrive Themes.
Toolbar Publish Button by wpUXsolutions.
[IN] User Role Editor by Vladimir Garagulya.
[IN] Web Stories by Google.
Wordfence Security by Wordfence.
[IN] WP-DBManager by Lester 'GaMerZ' Chan.
[IN] WP All Export by Soflyy.
[IN] WP Dark Mode by WPPOOL.
wpDataTables by TMS-Plugins.
WP Edit Pro by Josh Lobe.
WP phpMyAdmin by Puvox.software.
WP User Avatar by ProfilePress.
Yoast SEO Premium by Team Yoast.