What are the components of a Shaken Fist cluster?
Shaken Fist is composed of a series of components. There is Shaken Fist itself, which provides the orchestration and APIs to handle compute and virtual networks. The majority of this website discusses Shaken Fist, and if it is not specified, then you should assume that Shaken Fist is the component providing functionality.
Kerbside is a SPICE protocol native VDI proxy responsible for providing rich VDI experiences to users of Shaken Fist. You can read more about Kerbside at the page linked above.