The new version, 2.2.1, features one more joint, RopeJoint and a few minor bug fixes involving SecurityExceptions for sand-boxed environments. See the javadocs for more details.
When running you may be asked to accept a certificate from me (I just self signed the JARs). The certificates will expire six months from today…
All the releases require Java 1.6+. Be sure to type the “c” key to get the TestBed Control Panel so you can play with the simulator.
Use the Controls tab to view all the key board and mouse options. Use the Tests tab to run a test of your choosing. Use the Draw Options tab to set what is drawn to the screen. And finally, use the Simulation Settings tab to play with all the different settings allowed by the engine.