A free cross-platform editor for the DRAKON visual language.
A PlantUML editor written in Qt4
A modeling tool for software engineers (OO)
Free software for generating understandable and accurate fuzzy systems
Java library implementing a state machine by the UML standard.
Utility functionalities for simple Xml usage in Java
PetriNetExec a library for embedding Petri Nets into Java applications
XJML 1.0 is a platform for Verification and Validation of Java classes