The shuttle tag collectively refers to all C# shuttle components such as Shuttle.Esb (highly extensible service bus), Shuttle.Recall (event-sourcing), and various other re-usable components.
Shuttle is built mainly around Shuttle.Esb, which is a highly configurable free open-source enterprise service bus that provides you with a mechanism to create Autonomous Business Components that are loosely coupled, and Shuttle.Recall, which is an event-sourcing mechanism.