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Java with assertions, spoken: jazz, like the music. Improvement of JaWA language extension. Gives Java the concepts of Design by Contract from Bertrand Meyer, and Eiffel, and extends them with new features. [Open Source, GPL]
Supports load-time and runtime behavioural reflection in Java by allowing classes to be modified by Java code as they are loaded in. [Freeware, source available]
Extensible language based on Java. OpenJava MOP (Metaobject Protocol) is the extension interface of the language. Via the MOP, programmers can customize the language to implement new language mechanisms.
A variant of Java that adds parametric polymorphism, first-class functions, and class cases and pattern matching to the language. The compiler compiles into Java byte code so the binaries can be run on a normal JVM. [Freeware]