A simple editor for PlantUML. Requires PlantUML (and its dependencies, java and graphviz/dot).
Some features:
* update the diagram while editing
* code assistant to insert ready-made code snipets
* written in Qt4, so it should run on all platforms supported by Qt4 and PlantUML
* option to cache the PlantUML output to speed redo, undo and loading from disk
* can be used as a PlantUML viewer (see the wiki for more info)
