What is the difference between WCF project types?

Thick mode:

WCF Service Application

Create a preconfigured WCF application to be hosted on IIS.

WCF Service Library

Create a WCF application that will be added as a reference for use in another project and you must configure your hosting. It is a compiled component that can be used by other applications such as a Web service, Console, or Windows.

I found a article that describes more detailed information about the difference between WCF Service Application and WCF Service Library . The others I have not used, take a look at the links to see if it helps:

WCF Workflow Service Application

Create a WCF application based on WorkFlows . Scenario where a service depends on other external services where these calls may be long-lived (