1. Securimage Captcha
It is a open source free captcha script for generating the
complex captcha images and codes to protect your website from SPAM bots. This
scripts also provides the Audio captcha for vision impaired. This captcha is completely PHP based and
requires GD library support.
Click here for Demo
Paid/Free : Free
Licenses Type : BSD License
Download Link : http://www.phpcaptcha.org/download/
2. reCaptcha
Link : http://www.captcha.net/
Telling Humans and Computers apart, reCaptcha is best captcha available. This captcha is most widely used. This captcha is present for WordPress, MediaWiki, PHP, ASP.NET, Perl, Python, Java, and many other environments. reCAPTCHA also comes with an audio test to ensure that blind users can freely navigate your site. Any person having google account can use this captcha. It also generates multiple ideas such as ESP-PIX and SQUIGL-PIX. It is hard to break this captcha using OCR and other bots.
Click here for Demo
Paid/Free : Free
Licenses Type : NA
Download Link : NA
3. Motion Captcha
This is a good innovative captcha. MotionCAPTCHA is a jQuery CAPTCHA plugin,
based on the HTML5 Canvas Harmony procedural drawing tool by Mr Doob and the $1
Unistroke Gesture Regonizer algorithm (and the more recent Protractor algorithm
improvement), requiring users to sketch the shape they see in the canvas in
order to submit a form. This project can also be used for iPad and iPhone.
Click here for Demo
Paid/Free : Free
Licenses Type : NA
Download Link : https://github.com/josscrowcroft/MotionCAPTCHA
4. jCaptcha
JCaptcha is completely Java based captcha and is very good
captcha script. It provides a good noise and different fonts. You can find
documentation related to its integration on https://jcaptcha.atlassian.net/wiki/display/general/Simple+Servlet+Integration+documentation
this link.
Demo : NA
Paid/Free : NA
Licenses Type : NA
5. AJAX FANCY CAPTCHA
Ajax Fancy Captcha is one of the good innovative idea
present on the web. This Captcha uses different images that need to be dragged
and dropped into the circle. This
captcha is available in PHP and uses jquery extensively. It is also available
for WordPress.
Click here for Demo
Paid/Free : NA
Licenses Type : Copyright 2009 Web Design Beach. All rights
reserved.
6. 3DCaptcha
This a very good captcha to tell comuters and humans apart. This capatcha is created
using PHP and creates a good set of images to be recognized by humans.
Click here for Demo : NA
Paid/Free : Free
Licenses Type : 3DCaptcha
is released under GPLv3
Download link : http://code.google.com/p/3dcaptcha/downloads/list
6. Free Captcha-Service
Link : http://captchas.net/
This is one of the captcha that is available in multiple
technologies(PHP,ASP,Perl,Python etc..) and multiple languages. This captcha is
very weak and has same noise and font for its images. This captcha is also
available for audio format.
Click here for Demo
Paid/Free : This free
as well as paid service.
Licenses Type : 3DCaptcha
is released under GPLv3
Download link : http://code.google.com/p/3dcaptcha/downloads/list
7. Visual
and Audio PHP CAPTCHA Generation Class
This is a simple captcha and
has following features :
Multiple random TrueType fonts
Character rotation
Optional chararacter shadow
support
Optional site owner display
text
Random custom background
images
Font size selection
Greyscale or colour lines and
characters
Character set selection
Integration of validation
function for checking the user entered code with the generated code
This captcha uses Flite text to speech synthesis engine to generate sound files for audio
captcha. Author of this captcha has provided a good documentation for this
captcha.
Click here for Demo
Paid/Free : Free
Licenses Type : BSD License
Download Link : http://www.ejeliot.com/samples/php-captcha/download.php
8. freeCap Captcha
This is another PHP captcha
script. It has a good noise and its font is different and good.
Click here for Demo
Paid/Free : Free
Licenses Type : GNU GENERAL PUBLIC LICENSE
Download Link : http://www.puremango.co.uk/freecap1.4.1.zip
9. cool-php-captcha
Fonts used in this captcha are
very cool. It is very simple and easy captcha to implement. But this captcha
does not have noise.
Click here for Demo
Paid/Free : Free
Licenses Type : GNU GPL v3
Download Link : http://code.google.com/p/cool-php-captcha/downloads/list
10. Quick Captcha
QuickCaptcha provides CAPTCHA functionality to
any website running on a PHP-enabled web host. The graphic image below is
easily read by humans, but not so easily by computers. This makes it difficult
for someone to implement an automated mechanism to use resources that integrate
this feature.
QuickCaptcha allows you to specify string length, allowable
characters, color contrast, and several kinds of geometric obfuscation
elements.
Click here for Demo
Paid/Free : Free
Licenses Type : GNU GPL
Download Link : http://www.web1marketing.com/resources/tools/quickcaptcha/
11. WebSpamProtect
Link : http://webspamprotect.com/
This is one more captcha that will protect your website from
spam and bots. It is compatible with PHP, ASP, Perl and ASP.net. This is a
captcha also provides audio captcha. This website provides a captcha hosting
service. Also allows you to customize captcha for your website. It also
provides a wordpress plug-in.
Click here for Demo
Paid/Free : Paid
Licenses Type : Paid
licenses of WebSpamProtect
Download Link : NA
12. Cryptographp
Cryptographp is a PHP
script for generate captchas.
Cryptographp limit the robots bombarding spams and automating the forms: spaces
members subscriptions, guestbooks, forums... This script is free and does not
use any database. It is compatible with PHP >= 4.3.0.
Also plugins are available
for WordPress, wpMu for
WordPress, Symfony andGuppy. It also provides a free fonts with it.
Click here for Demo
Free/Paid : Free
Licenses Type : Cryptographp
is diffused with completed
CeCILL licence
The CeCILL licence is GNU GPL compatible.
The CeCILL licence is GNU GPL compatible.
Download link : http://www.captcha.fr/index.php?page=4&langue=en
13. BasicCaptcha and
ProCaptcha
Snaphost provides two captcha scripts, 1.BasicCaptcha
is free to use, 2. ProCaptcha is a paid version. This captcha has limited fonts
and not much use of noise and there is no audio captcha to use with it. For
both the version of the captcha you need to integrate their code with your
form.
Click here for Demo
Paid/Free
: Paid service.
Licenses
Type : NA
Download
Link : NA.
14. hOOmanTest
This captcha is different one as this is created using
Mootools a javascript frame work. All the captcha I found are created using
server side scripts. All other captcha
are either text or audio or both. But this captcha is not text, but we need to drag and drop the
objects to prove we are human. This requires Mootools 1.2 and hOOmanTest.js.
Click here for Demo
Paid/Free : Free
Licenses Type : NA
Download link : http://fragged.org/dev/hOOmanTest_captcha_for_mootools.php
15. Simple Ajax Captcha
This is simple captcha with ajax in use. It is used
Demo : NA
Paid/Free : NA
Licenses Type : NA
Download Link : http://rapidshare.com/files/148361490/Simple_AJAX_Captcha.zip
16. Are you Human
Link : http://areyouahuman.com/
Test whether you are human or not by playing games. This is
one of the innovative captcha that uses a game of picking up objects and
putting them in right position. It gives you some different test from other
text and audio based captcha. This captcha provides service of hosting captcha.
Click here for Demo
Paid/Free : Free
Licenses Type : NA
Download link : you will need to login to get it.
17. Solve Media
Link : http://www.solvemedia.com
This is a very different captcha and this one will help you
to earn revenue. This captcha uses advertisement to test weather user is human
or bot. This is a new approach for captcha allowing all the publishers and
advertisers to earn revenue. In this you have to identify the brand that is
shown in the captcha.
Click here for Demo
Paid/Free : Free(you can earn revenue from it).
Licenses Type : NA
Download Link : NA.
18. Fun Captcha
Fun captcha is designed as a game of tic tac toe. In this
the user has to get the X in one row to prove he is a human. This another
exciting approach for the captcha.
Click here for Demo
Paid/Free : Paid
Licenses Type : Private.
Download Link : NA
19. Qaptcha
The Qaptcha is a
simple jquery plugin that needs human interaction to complete the form. It is
also a good innovative captcha.
Click here for Demo
Paid/Free : Free
Licenses Type : NA
Download Link : https://github.com/alpixel/QapTcha
20. NLPCaptcha
Link: http://nlpcaptcha.in/index.html
This is another captcha that will
help the publishers to earn money from their captcha. This captcha uses the
advertisement to tell that user is bot or human. This captcha allows the
publishers and advertisers to earn revenue.
Paid/Free : NA
Licenses Type : NA
Download Link : NA
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