Alvas.Net - Offers components including Alvas.Suite, Alvas.Audio, Alvas.FileControls, Alvas.ShapeForms, Alvas.Controls, Alvas.Scriptor, and Alvas.Labels.
ASPPainter - .NET component can be used to create new and edit existing images. Complete source code is available for developers. Free and commercial versions.
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.
Coalesys, Inc. - Focusing on .ASP.NET User Interface controls.
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.
DotLucene - A port of the Jakarta Lucene search engine. [Open source, Apache Software License]
EaseSoft Barcode - .Net Windows Forms control and ASP.NET control for creating barcode images.
etive.com - Provides .NET components to use in both ASP.NET websites, and winform applications. Including dotEtiveFTP, dotEtiveSocket, dotEtiveTreeListView, etiveAspPack, etiveCreditCard, etiveDNS, etiveMessenger, etiveWHOIS.
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.
fyiReporting Software: RDL Project - A fully functional report and charting system based on Microsoft's Report Definition Language (RDL). [Open source, Apache]
Industrial DOT NET, Inc - Local IO assembly provides generic access to instrumentation data.
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.
KineticaRT - A collection of .Net components, including Windows .NET Forms сontrols, logic components, server components.
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.
Naxos Development - Offers a collection of .NET user interface controls and components. [Commercial]
NLinAlg - A .NET class library for working with algebra structures such as matrices and vectors. [Open source, GPL]
Olvio IT PlusSuite - Include .Net controls, editor controls, layout manager, notification controls.
Parole Lite - Generate pronounceable passwords. By 4ASPNET.
Perpetuum Software LLC - Specializes in the development of .NET reporting, charting, OLAP, gauge and instrumentation components for Visual Studio developers.
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.
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.
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.
Registry Toolkit .NET - Extends the functionality of the Microsoft registry classes. By ComponentSpace.
SharpSpell - AJAX-enabled ASP.NET and Desktop spell checker component for .NET developers. [Commercial, trial version]
SSDN: Simple Service Discovery for .NET - An open source service discovery mechanism for .NET remoting. Also provides a simple naming and directory service.
Subsembly - .NET components based on e-Banking standards (FinTS, HBCI), e-Government standards (OSCI) and smart cards (PC/SC, CT-API).
