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PolyJ
Java with support for generic programming in the form of parameterized types. Provides constrained parametric polymorphism, with advantages over some other proposals for adding genericity to Java. [Open Source, GPL] (infos)JWIG
Java extensions for high-level Web service development; Java-based high-level language to develop interactive Web services; merges main features of <bigwig> language into Java by providing explicit support for Web service sessions, safe XHTML dynamic document building. (infos)
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] (infos)
JaWA
Java With Assertions, an extension of Java by assertions, a concept borrowed from Bertrand Meyer, and Eiffel. Still available, superseded by Jass. (infos)
MetaJ
A generic protocol-based self-applicative interpreter for Java. Revolves around a generic reification procedure which can be used to reify any class of the interpreter. (infos)
The Java Modeling Language (JML)
A behavioral interface specification language that can be used to specify the behavior of Java modules. (infos)
JJ
Simplified subset of Java (supersedes Jr), and online environment for learning programming: simple, made for beginners, includes assertions and Design by Contract from Bertrand Meyer and Eiffel; class tested over 2 years, free accounts available. (infos)
Ptolemy II
Set of Java packages supporting heterogeneous, concurrent modeling and design. [Open Source, BDL] (infos)
Bali
Java with a spoonful of syntactic sugar: proposed set of additions to make Java terser and safer. Terseness makes languages easier to read, write, maintain. Ideas from Abundance (Byte Magazine Oct 1986), Eiffel, Pascal, Delphi, Smalltalk, PL/I, Algol-68, Forth, even COBOL. (infos)
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] (infos)