Math Captcha is a 100% effective CAPTCHA for WordPress that integrates into login, registration, comments, Contact Form 7 and bbPress.
The Add new recaptcha google plugin allows you to implement a super security REcaptcha form into web forms.
Antispam question for signup and comment forms of wordpress, set by admin, supports Multisite mode. The antispam question does not appear in single si
Hypecal extension for the Events Manager plugin to sell tickets, manage bookings and registrations and boost your event's promotion.
Adds the new google “Are you robot?” recaptcha to wp-login page, registration page, comment forms, buddypress registration page and contact form 7
Allows users to login or register by authenticating with an existing Google, Facebook, LinkedIn, Github, Reddit (and more!) account via OAuth 2.0.
This plugin disable auto-generated registration password and allow users to create own password on registration page.
Very flexible and easy to use AJAX Login plugin with redirects, customizable templates...
This plugin adds a reCAPTCHA form to BuddyPress registration form to keep your community spam free.
This plugin will automatically login your new user after the registration process
New User Approve allows a site administrator to approve a user before they are able to login to the site.
Require users to enter an activation code to access the site the first time. The activation code is emailed upon user registration.
Registration of participants for events. Option for up to 10 admin-defined fields in registration. Headers and button-texts can be changed in the set
CSSJockey Add-ons enables various features to extend the functionality of your WordPress website with an ever growing collection of add-ons.
Automatically removes spam user registrations and other old, unused user accounts. Blocks annoying e-mail to administrator after new registrations.
Adds simple, clean links so users can login/logout & register easily. Highly customisable and can be used as a widget.
Protect WordPress login, registration and comment form with the new Google's No CAPTCHA reCAPTCHA.
Require users to change their password on first login.
Deny access to blog for everyone but registered users!
User Meta Pro add-on for advanced settings
WP Login Screen is best option to change Login Screen in just one click and choose ready to use login theme.
Integrates reCAPTCHA anti-spam methods with WordPress including comment and registration spam protection.
Stripe Frontend Registration : Register to wordpress site by accepting payment from user using Stripe.
A plugin for extending your registration form
Adds new fields and requires new users to register additional fields (such as first name and last name) or any new field you wish to add. Note: WordP
Restricts access to all content except pages for non authenticated users.
Secures your wp site from hackers by hiding username of members from front side.
Add smooth ajax login/registration effects and choose where users get redirected upon log in/out. Supports SSL, MultiSite, and BuddyPress.
Make post, page or partial content visible to registered users only
Social Login by Janrain