Captcha
CAPTCHA: Completely Automated Public Turing test to tell Computers and Humans Apart
EasyCalcCheck PLUS
Protects Joomla! core forms and 3rd party extensions through the integration of anti-spam services and adds an arithmetic problem, a hidden field and a time lock. ECC+ has actually an average rating of 4.9 (all reviews without dubious votings)! Supp ...
RVS reCaptcha
This plugin adds Googles reCaptcha support to JForm compatible with Joomla 1.6 and 1.7, most importantly the user registration form. All you need to get a reCaptcha is a public/private key pair from google. In order to translate this extension into you ...
KeyCAPTCHA
KeyCAPTCHA - Innovative Anti-Spam Service. KeyCAPTCHA is an effective monetizing tool of your website. In contrast to other systems, KeyCAPTCHA solidly protects your website against spam as well provides you with an income acquisition instrument. The ...
OSOLCaptcha 
Aimed for non technical joomla site users who often find it hard making hacks in core code ,this plugin easily adds captcha to joomla forms for login,registration,contact us,reset passord and remind username. Just have to follow 3 steps. 1.install the ...
Joo ReCaptcha
Joo ReCaptcha Plugin add a free ReCaptcha form on your joomla webpage for prevent abuse from non human visitors. Our Plugin is Joomla! 1.5 & 1.6 native, is easy to setup and does not alterate original Joomla CMS code. With only few clicks you ...
Peoplesign photo captcha
Tired of distorted characters? Try Peoplesign, a photo captcha service. *Site visitors easily recognize objects in photos *Customize easily: number of photos, size of photos, photo categories *Can be enabled for registration, contacts, forgot passwor ...
XIJC
Captcha is an essential functionality to avoid spam. In recent days, we observed that many users are annoyed by lots-and lots of spam on there Joomla based websites. To resolve the issue, we shipped ReCaptcha with JomSocial Profile Types, but recaptcha do ...
Captcha by Ideal
Multiple CAPTCHA Engine is a system plugin to produce and verify captcha images. With this new version, you will get 3 different captcha systems (libraries): 1. SecurImage PHP library (requires GD image Library), 2. ReCAPTCHA (requires an AP ...
FunreCaptcha
This is a extension to integrate the reCaptcha into any form of the page. Which an easy to use management interface in the back-end. For more information watch the demo or see more explanation here http://www.all4coding.com Please give me some fe ...
Email Cloaking
This is an update to the default email cloaking plugin provided by Joomla 1.5. Protect your email from abuse while helping to digitize books! This plugin is meant to replace the default joomla email cloaking plugin to give it an additional option for r ...
Core Design Captcha plugin
Guard your forms against annoying spam and stay focused on your business everyday. Be first to say goodbye to spam.
Ajax Math Captcha
Allows to protect all Joomla! form from spam and bots, not only with captcha. Major level of security is granted using webservices like:Project Honeypot, StopforumSpam, Botscout, Fspmalist, Spamhaus, Akismet and Defensio. Added protection to KUNENA post ...
Security Images
Ever been to a site where you had to register and the registration form required that you type in the same phrase that is found in a hard-to-read image? Joomla! has now this possibility thanks to my component com_securityimages. It will protect You agai ...
Jollom
*** Protects all forms! A new and unique way of keeping spam away. See the tutorial video on our site! *** * Use the visual from protection tool (no programming skills required) that guides you to connect your forms to Jollom. * Perfect for sites th ...
Moovur
Moovur is a Joomla! extension that incorporates the Mollom anti-spam service in your Joomla! site and provides protection against spammers. Moovur provides protection of a Joomla! core installation but as with Joomla! it is incredible extensible so new op ...
Confident CAPTCHA
Confident CAPTCHA™ is a unique, image-based CAPTCHA solution that stops spam and bots in a way that is easy and intuitive for your website visitors. Rather than forcing people to decipher warped and distorted characters or words, Confident CAPTCHA present ...
tinCaptcha
Another simple captcha for Joomla 1.5. I've integrated with Joomla contact and Virtuemart registration. The component is created for easier integrating and languages installing. Captcha settings could be found in Plugin page. Please read the tutorial an ...
OSTWigits - Captcha
Captcha is a system plugin to produce and verify captcha images. We use freecap lib from: http://www.puremango.co.uk/cm_php_captcha_script_113.php This is for 1.5 ONLY.
Enmask Captcha
Regular text based and hosted Captcha, better Captcha experience. With this plugin you will be able to put the Enmask captcha in your Joomla forms easily. Forms in Joomla in which you can implement Enmask captcha are: 1. Registration form 2. Log ...
Joo ReCaptcha PRO
Joo ReCaptcha PRO is a comercial Upgraded version of our Joo ReCaptcha free plugin and add a lot of new features like, custom templates, random temnplates, ssl connection, translations and other. This PRO vesion also added option for secure login (modu ...