Tefkat is the transformation engine for the Eclipse Modeling Framework (EMF). It implements a state-of-the-art declarative model-to-model transformation language, including a source-level debugger and support for UML2, MOF2, and XML Schema-based models.
(via Jim Steel, who is one of the developers.)
That’s Tefkat with a k, not a c :-) and in case you’re confused, it’s still known as Tefkat — Jim’s subject is a reference to the original origin of the name Tefkat.