Download and run:
java -jar graphwalker-cli-4.3.3.jar
Download and run:
java -jar graphwalker-studio-4.3.3.jar
Open a browser and use url http://localhost:9090/studio.html
The source code is here: https://github.com/GraphWalker/graphwalker-project
Current and earlier releases of GraphWalker https://github.com/GraphWalker/graphwalker-project/releases