jonorossi 

Castle Core, including DynamicProxy, Logging Abstractions and DictionaryAdapter

Castle Windsor is best of breed, mature Inversion of Control container available for .NET.

Castle Windsor logging facility lets you easily inject loggers into your components. It offers integration with most popular 3rd party logging frameworks like log4net, NLog and Serilog (see Castle Core docs).

NVelocity is a port of the excellent Apache Jakarta Velocity project. It is a very simple, easy to learn and extensible template engine.

Castle log4net integration, logging services from Apache based on log4j

Castle Windsor WCF Integration facility enables integration with Windows Communication Foundation. It makes services and WCF proxies available as services in your application, lets you use non-default constructor and inject dependencies into your services, adds ability to easily set up your services... More information

Castle NLog integration, flexible and free open-source logging for .NET

Provides ability for the components to be created by factory objects. You can use it to register things like HttpContext in the container. This facility is mostly targeted towards legacy applications.

Castle Serilog integration, for simple logging with structured events

Castle Windsor event wiring facility provides ability to wire up classes exposing events to classes consuming them.

Integrates with synchronization elements of .NET framework (like ISynchronizeInvoke interface, SynchronizationContext), ensures components that inherit Control get created on UI thread etc.

Castle Windsor Quartz facility lets you easily add windsor to Quartz apps.

Provides ability to expose or consume components from another AppDomain using .NET Remoting.