JavaCET is an API wrote in Java that allows to analyze Java source code and libraries, and control its execution and its trace in an integrated and comprehensible object-oriented way. It allows backwards execution.
... visualizes EBNF (Extended Backus Naur Form). Therefore an .ebnf File is required, which contains rules written in EBNF. The program parses the rules, visualizes them as syntax diagrams and is able to generate .gif and .emf files for further use.
Flow4J is a java framework, that enables the user to model process flow with a gui interface. The flow may include tasks, decisions or calls to other process flows. The saved flow is in a jar file together with its bytecode.