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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WP Force SSL & HTTPS SSL Redirect
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Easy Featured Images
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Sticky CTA – Sticky Floating Notification bar, Buttons, Call To Action A/B Testing
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Style Contact Form 7
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OpenBadges.me Open Badges designer
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Cryptocurrency Donation Box – Bitcoin & Crypto Donations
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Gallery without the Fluff
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User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor
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WP jCryption Security
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Quiz and Survey Master (QSM) – Easy Quiz and Survey Maker
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Media Library Downloader
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Contact Information Widget
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Blue Captcha
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Beatport Discography shortcode
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Notifications for Forms & WordPress Actions
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Core Rollback
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Icegram Collect – Easy Form, Lead Collection and Subscription plugin
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Houzez Property Feed
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Campaign Monitor Synchronization
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commonWP