Open Source Web Services Tools in C#

Caucho's Hessian binary protocol has been ported for .NET. HessianC# (www.hessiancsharp.org) represents the latest implementation of Caucho's Hessian Binary Web Service Protocol. Hessian is a lightweight, self-describing binary RPC protocol. Hessian is a lightweight alternative to the XML-based web services protocols. The Hessian makes web services usable without requiring a large framework. Because it is a binary protocol, it is well-suited to sending binary data without any need to extend the protocol with attachments. The Hessian protocol eliminates external API descriptions like WSDL. HessianC# is also available for Compact Framework. It supports IIS. It is powerful and easy to use.

ServiceStack allows you to build re-usable SOA-style web services with plain POCO DataContract classes. The same DTO's can be shared with a .NET client application eliminating the need for any generated code. With no configuration required, web services created are immediately discoverable and callable via the following supported endpoints: - REST and XML - REST and JSON - SOAP 1.1 / 1.2 Services can run on both Mono and the .NET Framework and be hosted in either a ASP.NET Web Application, a Windows Service or Console application.