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.NET Domain-Driven Design with C#: Problem-Design-Solution
Aimee.net - Refactoring Lucene.NET
ASP.NET
ASP.NET MVC / Web API / Web Pages
AutoPoco
Caliburn Micro: WPF, Silverlight, WP7 and WinRT/Metro made easy.
Clay
Fabricator
Faker
Fluent Assertions
Fluent Interface Toolkit
Fluent Validation for .NET
Funq: a fast DI container you can understand
HTTP Server API Configuration
Hydrator: Flexible Test Data Generator
JsValidator
Labs Framework
LINQ IQueryable Toolkit
LINQ to Lucene
Munq: Tools for ASP.NET MVC