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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If-So Dynamic Content Personalization
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Custom Block Patterns
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Album Photostream Flickr Gallery
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The Future Is Now
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HTML Template for CF7
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Blocksy Companion
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Magic Liquidizer Responsive Table
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Popup Builder – Create highly converting, mobile friendly marketing popups.
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Extra User Details
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Search Regex
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Check Conflicts
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WP All Import – Drag & Drop Import for CSV, XML, Excel & Google Sheets
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Bop Search Box Item Type For Nav Menus
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Blogger Importer Extended
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Import / Export Customizer Settings
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Admin Menu in Frontend
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Screen Options and Help Show Customize
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Page-list
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WP Subdomains (Revisited)
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Timologia for WooCommerce