A simple plugin enabling you to log into WordPress by scanning a QR Code with your mobile device.
One click registration & login plugin for Twitter? Easy installation? Is it totally free and comes with support? Yeah!
This plugin protects your registered user base by preventing registration with a disposable email addresse (like the ones provided by mailinator).
Sb login widget that allows a user to login, register, reset their password, see recent activity,time,post and comment count in one place.
Blue Captcha is a powerful and highly customized WordPress plugin that effectively protects your WP blogs from spammers and unwanted persons.
Fight spam in registration form using color recognition.
Benchmark Email Lite lets you build an email list from your WordPress site, and easily send your subscribers email versions of your posts and pages.
Anti-Captcha is a transparent spam solution that does not require any end-user interaction.
Enhance default Registration form, Custom logo, Password field, Invitation codes, Paypal, Captcha validation, Email verification, user moderation
Adds new fields and forces new users to register additional fields (such as first name and last name) or any new field you wish to add.
BotDetect Captcha plugin is a powerful captcha protection for WordPress login, lost password, registration, and comment forms.
All-In-One Login Pack is a collection of 4 components which help to make login & registration forms work with your theme.
This plugin adds a new form of captcha to your Buddy Press registration and comment forms.
Use this plugin to prevent bots from spamming your website
NURCaptcha inserts a reCAPTCHA on the Register Form of your site to protect it against spambots.
s2Member® — a powerful (free) membership plugin for WordPress®. Protect members only content with roles/capabilities.
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