frankkoenen

This plugin provides a complete replacement for the standard WP login, registration and lost password interfaces. 
Provides a password recovery system, adds password expired feature, integrates with Really Simple Captcha and provides optional invitation code to register.
Simply download and install the plugin, activate it.
Customizable to integrate with LDAP-LPRM plugin ( <a href="https://wordpress.org/extend/plugins/ldap-login-password-and-role-manager/" rel="ugc">https://wordpress.org/extend/plugins/ldap-login-password-and-role-manager/</a>).
Captcha integration with Really Simple CAPTCHA ( <a href="https://wordpress.org/extend/plugins/really-simple-captcha/" rel="ugc">https://wordpress.org/extend/plugins/really-simple-captcha/</a> )
Configurations include assigning page or post ID to provide content as wrapper to the login, registration and lost password forms.
Configure one or more invitations codes to force new regristraints to supply the code to register.
<h3>Features</h3>
<ul>
<li>CSS ready for 100% customization to customize the cleaned forms for integration with your theme and the rest of your site.</li>
<li>Include or exclude active theme Javascript and CSS resources.</li>
<li>Replacement Login form.</li>
<li>Replacement for the Registration form.</li>
<li>Replacement for the Lost Password form.</li>
<li>Uses the standard WP Password recovery interface.</li>
<li>Optionally enable password expirary management.</li>
<li>Optionally enable registration invitation code verification.</li>
<li>Full system logging via syslog.</li>
<li>Fully customizable expired password reset and password recovery and user registration procedures.</li>
<li>All form control pages are customizable via blog-posts; assign posts for display with the specific forms as desired.</li>
<li>Can be AJAX enabled to embed the forms on any page, using shortcodes</li>
</ul>

Plugin Name: login_register

Provides a replacement for login and register and lost password and provides feature for password expiration and optional invitation codes.

Takashi Ito

Melmium provides custom authentication pages for building a membership site on WordPress. It replaces the default wp-login.php flow with theme-integrated pages for registration, login, and password reset.
Features:
<ul>
<li>Custom authentication pages (register, login, logout, password reset)</li>
<li>Email-based registration flow with token verification</li>
<li>Template override support — customize templates in your theme’s <code>auth/</code> directory</li>
<li>Google reCAPTCHA Enterprise integration (optional)</li>
<li>Configuration via <code>wp-config.php</code> constants (no settings page required)</li>
</ul>
日本語:
Melmium は WordPress で会員制サイトを構築するためのプラグインです。カスタム認証ページ（会員登録・ログイン・パスワードリセット）を提供し、テーマ側でテンプレートを自由にカスタマイズできます。
<h3>External Services</h3>
This plugin optionally connects to the Google reCAPTCHA Enterprise service for bot detection on authentication forms (registration, login, and password reset).
When data is sent: When the <code>MELMIUM_RECAPTCHA_ENABLED</code> constant is set to <code>true</code> in <code>wp-config.php</code>, a reCAPTCHA token is sent to Google’s servers each time a user submits an authentication form.
What data is sent: The reCAPTCHA token generated by the user’s browser and the site key configured for your project.
Service provider: Google LLC
<ul>
<li><a href="https://policies.google.com/terms" rel="nofollow ugc">Google reCAPTCHA Terms of Service</a></li>
<li><a href="https://policies.google.com/privacy" rel="nofollow ugc">Google Privacy Policy</a></li>
</ul>
If reCAPTCHA is not enabled (default), no data is sent to any external service.

Melmium

A minimal plugin to help you build a membership site with custom authentication pages.

Plugin Name: login_register vs Melmium