ASP.NET Zero vs ServiceStack: What are the differences?
What is ASP.NET Zero? Base solution for web applications. It is a starting point for new web applications with modern UI and SOLID architecture. It saves time by providing common application requirements as a pre-built Visual Studio solution (with full source code).
What is ServiceStack? *A configuration free, code-first, light-weight framework *. It is a configuration free, code-first, light-weight framework built on top of ASP.NET for building services and web applications. As the name suggests, it is a stack of services. It provides with just everything that one needs for building end-to-end web services.
ASP.NET Zero and ServiceStack can be categorized as "Frameworks (Full Stack)" tools.