Xtext: A framework for the development of domain-specific languages and other textual programming languages.
Sirius: Technology for creating custom graphical modeling workbenches by leveraging the Eclipse Modeling technologies, including EMF and GMF.
List of tools that may use Eclipse EMF but are available on private source-forges or others development repositories
SmartQVT: An open source implementation of the QVT-Operational language. This tool compiles QVT transformations into EMF-based Java programs.
Kermeta: A multi-purpose tool made by IRISA and based on EMF for model development, model constraint checking, model exploration, model transformation and much more.