Anonymous Posting plugin allows anonymous user to write their own posts using special page, no access to WP panel is needed.
Add reCAPTCHA V2 or hCAPTCHA to Contact Form 7
The WordPress contact form plugin inspired by Gutenberg. Drag & Drop online form builder that helps you create beautiful contact forms with just a few clicks.
Hercules Recaptcha adds a Recaptcha to the comment form for non-logged in users. It uses the latest Recaptcha API.
Captcha Bank is a anti-spam captcha plugin for WordPress forms that adds secure image captcha or math captcha to prevent spam.
Secure admin login with customize allows you to customize your WordPress admin login page within WordPress customizer.
Change default login site to a custom URL, block spam, bot registration, and brute-force using Google reCAPTCHA.
Easily add Contact AJAX forms to any page, post or widget area with an unlimited number of custom fields. Easy to manage and style!
Deter and monetize brute force attacks on your WordPress site with proof-of-work authentication. Similar to Google's reCAPTCHA at authentication. No more picking out street signs, cars, or storefronts!
The new reCAPTCHA for Contact Form 7 forms. Use shortcode [recaptcha].
Add Google reCaptcha to WordPress forms. Easy to add, advanced security for your forms.
Protect WordPress from spam with Dakyaco Captcha
Take control over the styling and layout of your contact form
Enables Google reCAPTCHA and hCaptcha for the WordPress website forms.
Adds Google’s No CAPTCHA reCAPTCHA to bbPress forms.
An addon for the Affiliates Manager plugin to add Google reCAPTCHA to the registration page
This Plugin will show neumeric recaptcha to protect spam message.