Simple question that blocks most spambots (and paid robots) by making them answer a common sense question
Scientifically proven by research from the University of Wollongong as the most secure text-based 3D CAPTCHA available -- on the most simple settings.
Сaptcha generated numbers and latin characters. It is intended only for use in custom forms and displays a simple shortcode.
Spam Master is the Ultimate Spam Protection plugin that blocks new user registrations and post comments with Real Time anti-spam lists.
Super-lightweight plugin adds Google's No Captcha reCAPTCHA box to your BuddyPress registration form. Tough on bots, Easy on humans!
Send an email with a validate link to verify the email address before completing the submission.
This plugin detects one-time email addresses (disposable email, trashmail, mailinator, 10minutemail) and helps to keep your userbase and comments clea
BuddyPress - Validate XProfile data with PCRE regular expressions.
Spam proof contact form that emails you the message and saves it in database.
Close comments, pingbacks and trackbacks on your posts automatically at intervals set by you
Reduces spam and troll comments by requiring commenters to answer a question.
Are you frustrated by using CAPTCHAS in comments? We provide you a good and simple solution to combat bot spam and human spam without captcha or calcu
Comment spam prevention without moderation, captchas or questions
Confident CAPTCHA™ is a clickable, picture CAPTCHA that stops spam and malicious bots, while remaining a very easy CAPTCHA for humans to solve.
The Add new recaptcha google plugin allows you to implement a super security REcaptcha form into web forms.
Plugin to reject spam. Port from same author from http://www.phpbbantispam.com Actually visits the URL from commenter to spider for spamwords.
Adds the new google “Are you robot?” recaptcha to wp-login page, registration page, comment forms, buddypress registration page and contact form 7
Block bots without annoying captchas. Cache friendly solution with rotating keys! Blocks comment, registration, and bbpress spam. Activate and done!
Stop a lot of spambots from polluting your site by making visitors identify a custom word displayed as an image before commenting.
Enhance your Gravity Forms to include anti-spam measures originally based on the work of David Walsh's "Zero Spam" technique.
This is a simple plugin that adds a recaptcha validation to the bbPress 2.0 topic creation and topic reply forum.
Your user can custom his own password on the registration screen with me.
WP Anti Spam can anti automated spambots or anti spams by"comment","ip","name","email","url".
Very light invisible method to block auto-spam when spam comment is posted. Pings and trackbacks cheks for real backlink.
Anti-Captcha is a transparent spam solution that does not require any end-user interaction.
Upon activation, SpamLord eliminates the potential for automated spam comments, as well as trackback spam.
Defeat automated spambots (even the new 'learning' bots with dynamically named hidden fields) by adding a client side generated checkbox.
A lightweight Formidable Pro anti-spam add-on that requires no interaction with the user.
This antispam plugin provides very simple(one-click) and powerful captcha for your blog.
Antispam for bbPress 2.x