AIP is an extensible ASP.NET web control that provides CAPTCHA protection for your blogs, forums, wikis and websites, greatly reducing the likelihood of unwanted form submission from automated spam and hacks. The control has design-time and templating support for Visual Studio.

Places a Captcha Image into an ASP.NET Web Forms application. If Captcha characters difficult to distinguish, control allows refresh of characters.

Captcha Control (C#) allows users to add a captcha to an asp.net page. The control supports declarative settings of fontsize, font family, color, captcha length, background image, character set, success, error and buttons' text. Supports audio - reading out the captcha text.

A .NET CAPTCHA generator

CaptchaMVC makes it easier for create captcha for you web-mvc project. It's developed in C#.

Distinct CAPTCHA used to add CAPTCHA to asp.net, InfoPath and SharePoint. The web service supports two methods one for generate and one to validate

Site that reflect webinars youtube site. provides pannel for published webinars discussions provides platform for webinar admin to notify on future webinars.

ine is a windows application to download files from popular file hosting sites

Custom Captcha Plugin for Kooboo CMS for adding content or sending feedback

A tiny application designed for downloading files available at the most popular file hosting servers. Don't click - queue it.

ASP.NET MVC compliant captcha generation library.

MyCaptcha is a free opensoruce ASP.NET Captcha control written in C# 3.0.

CAPTCHA control for asp net web form applications including multi language support, reload captcha, audio captcha.

Here you can find some CommunityServer extensions and bug fixes. The main goal is to provide you with the ability to correct some common problems with minimal changes (mainly config files changes).

A Persian Captcha that use number in letters

reCAPTCHA4net allows to easily integrate the latest version of Google reCAPTCHA API into ASP.NET web application (both Web Forms and ASP.NET MVC are supported).

Simple integration of Recaptcha in MVC5 Website. Simple and easy to use.

A library that allows a developer to easily integrate Google's Recaptcha service in an ASP.NET application.

A collection of reusable abstractions for enterprise application developer: caching, IoC, pagination, repository, application services, unit of work, background processing, exception trace policy, work item, etc. Integration with Unity 2.0, EntLib 5.0, ASP.NET MVC 3.0, WatiN 2.0, Memcached 1.4.5.

Simple Silverlight Captcha.