Fulcrum was originally created as part of the Turbine 3 effort. The idea was to be able to decouple the services from Turbine 2 allowing them to be used on both projects.
Fulcrum is currently evolving into a component repository based on the Avalon framework. Each service is being converted into a stand alone component that can be released independently of the other components. This will allow the Turbine project to to release components as they change instead of having to release everything at once. This will also allow other projects to take advantage of these components.
All components are compatible in Avalon's ECM container. Any dependencies on other components, system properties, or context elements are clearly documented in the docs for each component.
Additionally, Fulcrum offers the Yaafi component. Yaafi (Yet Another Avalon Framework Implementation) is a very simple container that is meant to be used with singleton components. It is perfect for unit testing your components. You can then run them in any other Avalon container like ECM, Phoenix, Excalibur, etc..