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Open Source Network Clients in C#

• OpenSmtp.net - OpenSmtp.net is an open source SMTP component written in C#

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Open Source Network Servers in C#

• CSharp Email Server - The C# Mail Server is a C# port of the Java Email Server (JES). JES is an established email server targeted at small centrally maintained installations.

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Open Source PDF Libraries in C#

• iTextSharp - iTextSharp is a library that allows you to generate PDF files on the fly.

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Open Source Persistence Frameworks in C#

• OJB.NET - OJB.NET is an object-to-relational persistence tool for the .NET platform.

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Open Source Portals in C#

• OmniPortal - OmniPortal was built on the idea of having a web-portal-kernel, that could handle security, themeing, and localization.

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Open Source Profilers in C#

• NProfiler - An application profiler for .NET

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Open Source Project Management Tools in C#

• User Story.NET - This project is a tool for Extreme Programming projects in their User Story tracking.

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Open Source RSS & RDF Tools in C#

• RSS Bandit - A desktop news aggregator written in C#

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Open Source Rule Engines in C#

• NxBRE - NxBRE is the first open-source rule engine for the .NET platform and a lightweight Business Rules Engine (aka Rule-Based Engine)

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Open Source Search Engines in C#

• Lucene.Net - Lucene.Net is a complete up to date .NET port of Jackarta Lucene

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Source Control Tools in C#

• NetCvsLib - NetCvsLib is a CVS client written entirely in C# for the .NET platform. It is implemented as an assembly, and thus can easily be incorporated into other projects.

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Open Source SQL Clients in C#

• Database Commander - Database Commander is a database manager with user-friendly interface for Windows operation system.

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Open Source Template Engines in C#

• NVelocity - NVelocity is a .Net-based template engine. It permits anyone to use the simple yet powerful template language to reference objects defined in .Net code.

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Open Source Testing Tools in C#

• NUnit - NUnit is a unit-testing framework for all .Net languages. Initially ported from JUnit

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Open Source Web Frameworks in C#

• Maverick.NET - Maverick.NET is a .NET port of Maverick, a Model-View-Controller (aka "Model 2") framework for web publishing. It is a minimalist framework which focuses solely on MVC logic, allowing you to generate presentation using a variety of templatin