- EBackend — An abstract base class for backends
- e-backend-enums
- EBackendFactory — An abstract base class for backend factories
- EDataFactory — An abstract base class for a backend-based server
- EDBusServer — An abstract base class for a D-Bus server
- EExtensible — An interface for extending objects
- EExtension — An abstract base class for extensions
- EModule — A module loader
- ESubprocessFactory — An abstract base class for a backend-subprocess server