Akismet (http://akismet.com) is a free anti-blog-spam service, effectively blocking 92% of all comment spam, trackback spam and pingback spam.

This project provides a antispam daemon to detect and greylist or reject spam in your MTA by analyzing the smtp envelope using different rules. At the moment Postfix and Exim are supported. The daemon runs on Windows (using .Net 3.5) as well as on Linux (using Mono 2)

Anty spam plugin for Microsoft Outlook 2007 and 2010, based on http://www.codeproject.com/KB/cs/DNSBL_Lookup.aspx article lines version 1.x.x for MS Outlook 2007 lines version 2.x.x for MS Outlook 2010 All it's developed in <C#> VSTO 4.0

A simple C#.NET wrapper for the BlogSpam.net comment spam service.

Cheescloth is a security script that is used to monitor and block email being brute force sent to your mail server by zombie machines in control by spammers and

DotNetNexusSpam is an email spam filter designed to work with the Mail Enable. It searches for spam phases and then tags the subject or deletes the email off the server. Spam phases can be emailed directly to the spam filter and it will add it to the spam phase list.

Avoid SPAM! Email Protector protects the email addresses on your website. It's an easy to use ASP.Net web control that hides email addresses from website email harvesters. The email address is encrypted using the XTea algorithm. (http://en.wikipedia.org/wiki/XTEA)

MailSystem is a suite of .NET components that provide users with an extensive set of email tools. MailSystem provides full support for SMTP, POP3, IMAP4, NNTP, MIME, S/MIME, OpenPGP, DNS, vCard, vCalendar, Anti-Spam (Bayesian , RBL, DomainKeys), Queueing, Mail Merge and WhoIs

A library to access the Mollom anti-spam service from .NET applications.

This project is created to generate, read, edit and manipulate PDF files in .NET applications with C#, VB.NET.

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

Spam filter for SMTP server. Check emails for spam against 9 different filters. Easy to customize and tune to your specific needs. Easy to create new filters. Eliminate 99% of spam.

A set of libraries, tools, and utilities for .NET developers to secure their applications including site spam filtering services, CAPTCHA controls, malware & phishing filter, and customizable password generator.

VWD-CMS is a content management system built for ASP.NET 2.0 websites. VWD-CMS has been developed entirely in Visual Web Developer. Content files are stored on the local file system which simplifies backup, restore, and deployment. SQL Server is required only if you choose to use ASP.NET Membership, VWD-CMS Member Services, and VWD-CMS Forums.

Wireless Tag Manager application is distributed with CAO Gadgets Wireless Smart Tag products to create/manage RFID tag list, beeping each tags, receive notification from each tags, receive motion sensor tag magnetic 3D vector readings, and writing to flash memory inside each tag.