Taras Kushnir

Private Captcha WordPress Plugin integrates Private Captcha with your WordPress site to protect forms from spam and abuse.
Features: 
* Protect login, registration, password reset, and comment forms 
* Flexible widget configuration (theme, language, start mode) 
* EU compliance with EU-only endpoints and custom domains 
* WP-CLI commands for emergency management 
* No tracking, privacy-focused captcha solution
Supported Forms: 
* WordPress Login Form 
* WordPress Registration Form 
* WordPress Password Reset Form 
* WordPress Comment Forms (logged-in and guest users) 
* WPForms 
* Contact Form 7
More forms (including popular plugins) are currently in progress of being added.
<h3>External services</h3>
This plugin uses <a href="https://privatecaptcha.com" rel="nofollow ugc">Private Captcha</a> API to request and verify captcha challenges and their solutions, when protection is enabled on user-configured forms.
When solving of the captcha widget challenge begins, a new challenge is requested from Private Captcha API. When submitting the relevant form (e.g. Comment Form or Login Form), challenge solution is sent to Private Captcha API.
During requesting challenges or verifying solutions, no Personal Data (within meaning of Art. 4 (1) GDPR) is neither collected, nor sent. Check all relevant information in the Private Captcha’s <a href="https://privatecaptcha.com/legal/privacy/" rel="nofollow ugc">Privacy Policy</a>.

Private Captcha

Private Captcha protects your WordPress website from spam and abuse with a privacy-first, independent CAPTCHA solution made in EU.

Dennis

Protect your BuddyPress Installation from strangers. Only registered users will be allowed to view the installation and all other users will be redirected to the login page. Users attempting to view blog content via RSS are also authenticated via HTTP Auth.
You can exclude the registration, the homepage and blog pages (e.g. posts, archives and non-buddypress pages) from protection. In combination with the plugin ‘Invitation Code Checker’ your installation stays private but the registration is for users with a special password open.
The plugin includes a German and Hebrew (thanks to gstupp) translation.

Private BuddyPress

Protect your BuddyPress Installation from strangers. Only registered users will be allowed to view the installation.

Private Captcha vs Private BuddyPress