GromBeestje

The OAuth plugin for WordPress allows you to provide authentication against any 
OAuth provider. This plugin is uses the OAuth library by Manuel Lemos. The 
plugin allows the admin to select any from the services supported 
out-of-the-box by the said library. Additionally it is possible to configure a 
service manually, which means any site supporting the OAuth protocol can 
be used.

BlaatLogin: OAuth

This plugin turns your WordPress website into an OAuth Consumer. It allowsallows your users to sign in with any OAuth provider.

Digitaldive

DigitaDive Login with Google One Tap adds a modern, monochrome Google sign-in experience to WordPress. It supports the One Tap prompt for logged-out visitors and a shortcode for placing the Google button anywhere.
Google is a trademark of Google LLC. This plugin is not affiliated with or endorsed by Google.
Features:
<ul>
<li>One Tap prompt across your site (optional)</li>
<li>Shortcode button: <code>[ddgot_google_login]</code></li>
<li>Login button on WordPress/WooCommerce login and registration forms</li>
<li>New user creation controls and role assignment</li>
<li>Admin access restrictions for non-admin users</li>
<li>Google avatar support</li>
<li>Optional admin bar hiding for non-admin users</li>
<li>Optional email domain allowlist</li>
<li>Optional email allowlist and prompt exclusions</li>
<li>Optional failure logging and session-based prompt control</li>
</ul>
<h3>External Services</h3>
This plugin integrates with Google Identity Services (Google One Tap) to allow users to sign in with their Google account.
When the One Tap prompt or button is enabled, the user’s browser loads Google’s Identity Services JavaScript from https://accounts.google.com/gsi/client.
When a user signs in, the plugin sends the Google ID token to Google’s token verification endpoint at https://oauth2.googleapis.com/tokeninfo to validate the token before logging the user in.
Data sent includes the ID token and request metadata (such as IP address and user agent) required to complete these requests.
All plugin CSS/JS assets are bundled locally; the only external resources used are Google’s Identity Services script and the token verification endpoint described above.
Site owners must create a Google OAuth Client ID in Google Cloud Console to use this service, and end users need a Google account to sign in.
Terms of Service: https://developers.google.com/terms 
Privacy Policy: https://policies.google.com/privacy
<h3>Privacy</h3>
This plugin does not store Google passwords. It creates or updates WordPress user accounts using the profile data returned in the ID token and stores the Google avatar URL if provided.

DigitaDive Login with Google One Tap

Secure login with Google One Tap and a button for WordPress with a shortcode and site-wide prompt.

BlaatLogin: OAuth vs DigitaDive Login with Google One Tap