Jass
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]
Java > Extensions
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Kiev
Prolog-like engine, multimethods, parameterized types (derived from Pizza), closures (derived from Pizza), arithmetic types, type states and cases (derived from Pizza), 'foreach' statement, global method and variable definitions, virtual fields, variable number of arguments of methods, project, incremental compiling. [Open Source, GPL]
Java > Extensions
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Ptolemy II
Set of Java packages supporting heterogeneous, concurrent modeling and design. [Open Source, BDL]
Java > Extensions
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JWIG
gt; language into Java by providing explicit support for Web service sessions, safe XHTML dynamic document building.
Java > Extensions
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Pizza
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]
Java > Extensions
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