bbv.Common is a library of .NET components and functionality including: * (a)synchronous notification component with thread switching using publisher-subscriber pattern, * hierarchical state machine with fluent definition syntax, * programmatic, loosely coupled, context based rule engine, * support for active objects to build multi-threaded applications

Castle is an open source project for .NET that aspires to simplify the development of enterprise and web applications. Offering a set of tools (working together or independently) and integration with others open source projects, Castle helps you get more done with less code and in less time.

Cses is a C#.NET port of the Java Email Server (JES).

NAnt is a free .NET build tool. In theory it is kind of like make without make's wrinkles. In practice it's a lot like Ant.

NHibernate is a mature, open source object-relational mapper for the .NET framework. It's actively developed , fully featured and used in thousands of successful projects.

The most popular open-source service bus for .net Powerful, yet lightweight. Pluggable, yet simple to use. Enterprise development, done right. Zero Install - working pub/sub messaging in under 5 minutes.

SidePOP allows you to retrieve email very easily from a POP3 account. SidePOP is one DLL (with a dependency on log4net) and a simple configuration that allows you to enhance your applications by giving them the gift of receiving email. SidePOP has an easy configuration - it's the same settings you need to set up email on your phone or in a mail client to check your email. Then all you do is subscribe to the events and you are good. It can't get much harder than that.

A project to automatically implement INotifyPropertyChanged using DynamicProxy2