CACAO is a free virtual machine for running Java programs It has a state-of-the-art optimizing JIT compiler, with performance competitive with that of the Sun HotSpot product JVM. . Note that CACAO is not officially certified as Java. (Nor is any other free virtual machine.) This is because some aspects of Java -- such as the Swing extensions -- are not implemented by the free GNU Classpath libraries, which the CACAO runtime uses.
