"Concret" is a web-base model editor which can be configured for different DSLs by providing a metamodel and optional concrete syntax definition in HTML/CSS. Models are created mainly by typing text in the browser, using autocompletion, constraint checks, etc. They are exchanged in JSON format with any backend, e.g. via AJAX.
Web:
http://concrete-editor.org
Project on github:
http://github.com/mthiede/concrete
Screencast:
http://vimeo.com/9164866

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