ASPBridge
   Component for including ASP code in ASP.NET pages.
   http://www.iprisma.com/aspbridge/

ASPPainter
   .NET component can be used to create new and edit existing images. Complete source code is available for developers. Free and commercial versions.
   http://dotnet.asppainter.com/

Alvas.Net
   Offers components including Alvas.Suite, Alvas.Audio, Alvas.FileControls, Alvas.ShapeForms, Alvas.Controls, Alvas.Scriptor, and Alvas.Labels.
   http://www.alvas.net/

BlackBytes Registry for .NET
   Provides classes that manipulate the system registry.
   http://www.blackbytes-components.com/product.aspx?id=2&mt=1

BlackBytes Software & Consultancy, Ltd.
   Develops .NET components including: Security for .NET, Registry for .NET, DNS for .NET, NetworkTime for .NET, Whois for .NET, TimeZoneConverter for .NET, FTP for .NET.
   http://www.blackbytes-components.com

CenterSpace NMath
   .Net components suite contains interfaces to BLAS and LAPACK, random number generators, anova, regression, probability distributions, sparse matrices, hypothesis tests and descriptive statistics.
   http://www.centerspace.net

Coalesys, Inc.
   Focusing on .ASP.NET User Interface controls.
   http://www.coalesys.com

Dart Communications
   Offers a web-based HTML editor which enables users to create rich-text content in a browser as well as TCP and SNMP components.
   http://www.dart.com/

Devshock .NET EventMonitor
   Component for notification of events in application. All information is queued and transfered in standard XML format. With this model the application thread is not blocked.
   http://www.devshock.com/products/tool/eventmonitor/

Devshock .NET ThreadPoolManager
   Offer an easy way to manage the .NET ThreadPool.
   http://www.devshock.com/products/tool/ThreadPoolManager/

DotLucene
   A port of the Jakarta Lucene search engine. [Open source, Apache Software License]
   http://www.dotlucene.net/

EaseSoft Barcode
   .Net Windows Forms control and ASP.NET control for creating barcode images.
   http://www.easesoft.net

Extreme Optimization
   Numerical components for .Net includes complex numbers, vectors and matrices (BLAS and LAPACK), numerical integration and differentiation, solving equations, curve fitting, special functions, statistics.
   http://www.extremeoptimization.com/

InRule .NET Rule Engine
   A rule engine that provides a framework for non-technical logic maintenance and deployment within server, web-based, and desktop applications.
   http://www.inrule.com

Industrial DOT NET, Inc
   Local IO assembly provides generic access to instrumentation data.
   http://industrialdotnet.com/

KineticaRT
   A collection of .Net components, including Windows .NET Forms сontrols, logic components, server components.
   http://www.kineticart.co.uk/Default.asp?page=Products/KineticaRT

Lanap BotDetect
   .NET control to protect website from spambot (form robots) with asp.net captcha code image. ASP.NET security solution to prevent automated registrations.
   http://www.lanapsoft.com/

NLinAlg
   A .NET class library for working with algebra structures such as matrices and vectors. [Open source, GPL]
   http://nlinalg.sourceforge.net/

Naxos Development
   Offers a collection of .NET user interface controls and components. [Commercial]
   http://www.naxosdev.com/

Olvio IT PlusSuite
   Include .Net controls, editor controls, layout manager, notification controls.
   http://www.olvio.com/WebModules/Products/PlusSuite/PlusSuite.aspx

Parole Lite
   Generate pronounceable passwords. By 4ASPNET.
   http://www.4-asp.net/products/parolelite.aspx

PortSight Secure Access for .NET
   Manages users and their access to WinForms and WebForms applications, Web Services and Web content. It features user roles, permissions, auditing, delegation and import from Active Directory.
   http://www.portsight.com/Products.aspx?AliasPath=Products/Secure%20Access/Secure%20Access&CultureAlias=en-US

PortSight Task Scheduler for .NET
   Immediate or planned execution from ASP.NET. It allows processing of long-running ASP.NET pages, running command line utilities or other server-side tasks without page time outs and under a privileged account.
   http://www.portsight.com/Products.aspx?AliasPath=Products/Task%20Scheduler/Task%20Scheduler&CultureAlias=en-US

Quantum Whale
   Editor.NET component is an advanced code editor allowing integration of a highly flexible edit control in your .NET applications; Outbar.NET is a component pack allowing incorporate a side bar control into any .NET applications.
   http://www.qwhale.net

Real Components .NET
   .NET components for ASP.NET and Windows .NET applications includes IIS Manager, RSS Manager, Credit Card Validator, Web Header Manager. [Shareware]
   http://www.realcomponents.com/

Registry Toolkit .NET
   Extends the functionality of the Microsoft registry classes. By ComponentSpace.
   http://www.componentspace.com/registrytoolkit.aspx

SSDN: Simple Service Discovery for .NET
   An open source service discovery mechanism for .NET remoting. Also provides a simple naming and directory service.
   http://www.michaylov.com/spiro/ssdn/ssdn_overview.html

Security for .NET
   Implement managed role-based security for .NET Framework. The Security for .NET enables you to manage Windows security.
   http://www.blackbytes-components.com/product.aspx?id=1&mt=1

SharpSpell
   AJAX-enabled ASP.NET and Desktop spell checker component for .NET developers. [Commercial, trial version]
   http://www.tachyon-labs.com/sharpspell.aspx

Subsembly
   .NET components based on e-Banking standards (FinTS, HBCI), e-Government standards (OSCI) and smart cards (PC/SC, CT-API).
   http://subsembly.com/

Trace Listeners .NET
   A cyclic file trace listener. By ComponentSpace.
   http://www.componentspace.com/tracelisteners.aspx

USPExpress Math Parser .NET
   Parse and evaluate scientific, engineering and mathematical expressions on-the-fly. BY Unisoft Plus, Ltd.
   http://www.unisoftplus.com/uspexpress/

WebCab Components
   .Net components for financial and mathematical applications.
   http://www.webcabcomponents.com/dotNET/

Xtras.Net
   An online reseller of third party .NET components.
   http://www.xtras.net/

ZXValidator
   .NET component for credit card numbers validation. It currently supported credit card types: Visa, MasterCard, Amex, JCB, Diner's Club, Discover/Novus.
   http://zamov.online.fr/zxvalidator/

commandLine .NET
   Execute DOS/console commands from within .NET. Returns output, the DOS return code, and completion status. By AS-Pro Software.
   http://www.asprosoft.com/products_commandline.html

decloak
   .Net components including: dual listbox with re-ordering, dependent listboxes, click click e-mail reports.
   http://www.decloak.com/Products/NET/

etive.com
   Provides .NET components to use in both ASP.NET websites, and winform applications. Including dotEtiveFTP, dotEtiveSocket, dotEtiveTreeListView, etiveAspPack, etiveCreditCard, etiveDNS, etiveMessenger, etiveWHOIS.
   http://www.etive.com/

fyiReporting Software's RDL Project
   A fully functional report and charting system based on Microsoft's Report Definition Language (RDL). [Open source, GPL]
   http://www.fyireporting.com