XrcPad is a simple interactive XML resource editor for wxWidgets, for trying out xrc code snippets, similar to the WPF tool XamlPad. Currently XrcPad is unsophisticated, heavy on typing (no Intellisense) and without syntax error hints.
PORIS toolkit allows describing graph-based systems and their behavior in a snapshot. It provides a web
editor for a domain visual specific language (DSL) and transformation tools to generate software prototypes, system configurations, ...