Graphical language server platform for building web-based diagram
an Open Source BPMN 2.0 / DMN 1.1 Modeler
An editor for the specification of Graphol ontologies
A modern note taking app based on GIT
PUed - PlantUML Editor
A free cross-platform editor for the DRAKON visual language.
UML diagram editor
An editor for the specification of Graphol ontologies
A PlantUML editor written in Qt4
Cress is a comprehensive toolset for graphical service/workflow design
The HTML 5 JavaScript diagramming library
An Eclipse plug-in for the IBM FileNet P8 Content Engine and CMIS
Business graphics diagramming application + customizable shape lib.
Pony is a fast and easy to use Python ORM