The Google Tag Manager plugin adds a field to the existing General Settings page for the ID and outputs the javascript to make it work.
More Plugins
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Wordfence Security – Firewall, Malware Scan, and Login Security
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WP Media Category Management
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Custom Post Type Maker
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Cyr-To-Lat
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Layout Grid Block
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Multisite Post Duplicator
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Translate WordPress – Google Language Translator
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PHP Code Widget
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Carousel, Slider, Photo Gallery with Lightbox, Video Slider, by WP Carousel
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Advanced Custom Fields Repeater & Flexible Content Fields Collapser
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Safe Redirect Manager
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Connector for Gravity Forms and Google Sheets
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Twenty Eleven Theme Extensions
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PublishPress Blocks – Block Controls, Block Visibility, Block Permissions
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Popups – Submission Messages For Contact Form 7
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New Recent Posts Select Categories By Thao Marky
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Image Hover Effects Ultimate ( Image Gallery, Effects, Lightbox, Comparison & Magnifier )
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Custom Post Types and Custom Fields creator – WCK
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(Simply) Guest Author Name
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XML Feed for Skroutz & BestPrice for WooCommerce