| AutoMapper | http://www.codeplex.com/AutoMapper/ | A convention-based automapper |
| CodeCampServer | http://codecampserver.com | Sample MVC app for hosting code camps |
| ColorCode | http://colorcode.codeplex.com | Library for syntax highlighting |
| Concordion.Net | http://code.google.com/p/concordion-net/ | An acceptance testing framework that allows users to place their specifications in an HTML file. These files contain references to fixtures in test code that are executed by Concordion |
| CThru | http://cthru.codeplex.com/ | A collection of open source projects, all on the Typemock Open-AOP API |
| dnAnalytics | http://www.codeplex.com/dnAnalytics | An open source numerical library for the .NET Framework and Mono |
| Docu | http://docu.jagregory.com/ | A documentation generator for .Net that isn't complicated, awkward, or difficult to use |
| Fluent ADO.Net | http://fluentado.codeplex.com/ | A lightweight wrapper around Ado.Net, designed to be used in a fluent manner, encourage code reused, and make mapping to domain classes easier. |
| Fluent NHibernate | http://fluentnhibernate.org/ | Fluent, XML-less, compile safe, automated, testable mappings for NHibernate. |
| FubuMVC | http://fubumvc.pbworks.com/ | A Front Controller-style framework designed primarily for Web applications built upon ASP.NET (though it could be used for non-web/non-ASP.NET purposes) |
| HandleCheck | http://code.google.com/p/handlecheck/ | A Java Google AppEngine-based service for checking available handles (a.k.a. usernames) across the Web |
| HORN | http://groups.google.com/group/horn-development | .NET port of Portage |
| IncludeCombiner | http://blog.neverrunwithscissors.com/tag/include-combiner | A component for mashing together & compressing scripts & CSS within an ASP.NET MVC site to improve front-end performance |
| Index 4 Objects | http://i4o.codeplex.com/ | Class library that extends LINQ to allow you to put indexes on your objects. The speed of LINQ operations are often over one thousand times faster than without i4o. |
| LinFu | http://code.google.com/p/linfu | A set of libraries that extend the CLR by adding: AOP, dynamic proxies, late binding, mixins, universal event handling, closures with lambda arguments, duck typing, design by contract |
| Machine | http://groups.google.com/group/machine_users | Machine is a collection of libraries and utilities. |
| MassTransit | http://code.google.com/p/masstransit/ | Lean service bus implementation for building loosely coupled applications using the .NET framework |
| MVCContrib | http://mvccontrib.org/ | Adds additional functionality on top of the MVC Framework |
| N2 CMS | http://code.google.com/p/n2cms/ | Open source content management system based on ASP.NET version 2.0 (or more) |
| NBehave | http://nbehave.org | A framework for Behaviour-Driven Development |
| NGenerics | http://www.codeplex.com/NGenerics | A class library providing generic data structures and algorithms not implemented in the standard .NET framework |
NHaml
| http://code.google.com/p/nhaml/ | A pure .NET implementation of the popular Rails Haml view engine |
| NHibernate | http://nhibernate.org | Seriously, do you need a description? |
| Ninject | http://ninject.org | Lightning-fast dependency injection for .net |
| NServiceBus | http://www.nservicebus.com/ | A powerful, yet lightweight, open source messaging framework for designing distributed .NET enterprise systems |
| SolrNet | http://code.google.com/p/solrnet/ | Solr client for .NET. Solr is an open source enterprise search server based on the Lucene Java search library |
| State Machine Toolkit | http://sourceforge.net/projects/smtoolkit/ | A generic state machine in C# |
| VisualCI | | A suite of applications that monitor the health of builds over different build server types (CruiseControl, TeamCity, etc.) **Not published yet** |
| Regionerate | http://www.rauchy.net/regionerate | An automatic layout enforcement tool for the C# programming language |
| Rhino | http://sourceforge.net/projects/rhino-tools | A collection of useful tools for developers in .Net, including mocking framework, utility library, extension to Castle's Windsor, etc. |
| S#arp Architecture | http://sharparchitecture.net | An architectural foundation for building maintainable web applications with ASP.NET MVC |
| Spark | http://sparkviewengine.com/ | A view engine for Asp.Net Mvc and Castle Project MonoRail frameworks |
Story Teller
| http://storyteller.tigris.org/ | Automated acceptance testing for .Net |
| Structure Map | http://structuremap.sourceforge.net/Default.htm | A Dependency Injection / Inversion of Control tool for .Net |
| StyleCop for ReSharper | http://www.codeplex.com/StyleCopForReSharper | A ReSharper plugin that allows Microsoft StyleCop to be run as you type, generating real-time highlighting of violations and automatic fixing of StyleCop issues |
| Subtext | http://subtextproject.com/ | A personal blog publishing platform that focuses on usability, elegance, and simplicity |
| Tarantino | http://code.google.com/p/tarantino/ | A collection of libraries and tools to facilitate change management and development |
| xUnit.net | http://xunit.codeplex.com/ | Unit testing framework for .NET |