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A plethora of other tools and frameworks utilise Ecore models to provide important and time-saving functionality, either part of the Eclipse Modelling project or the surrounding eco-system.
For more, see our Ecore page
Genmodel - generating Java code
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While the editor support provided by EMF will give you functionally complete editors, they are not usable/suitable for most end-users. Better editors can of course be developed by hand, but several frameworks allow you to make good editors without a lot of coding. The EMF Forms project allows you to build a custom, form-based GUI for your domain data without coding. Instead you compose your form from layouts and editing widgets and configure how they operate on the underlying domain data. The EMF Client Platform (ECP) provides a more complete (and complex) application development framework based on the same ideas. If you prefer a diagram notation for your data, combined with some form support, or advanced tables, you can use the Sirius framework.