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Currently, arguably, the most interesting one is that created by Walter Bright. This language aspires to take the positive features of C, C++ and a few other Algol syntax based programming languages, and to drop the negative features.
A reference document of the language
D drops archaic C++ features like the preprocessor and forward declarations. It adds modern features like design by contract, unit testing, true modules, automatic memory management, first class arrays, closures, and a reengineered template syntax. D retains C++'s ability to do low level coding, and adds to it with support for an integrated inline assembler. C++ multiple inheritance is replaced by single inheritance with interfaces. D's declaration, statement and expression syntax closely matches C++.
The inline assembler is typical of the differentiation between D and application languages like Java and C#. An inline assembler allows a programmer to enter machine-specific assembly code alongside standard D code -- a technique often used by systems programmers to access the low-level features of the microprocessor needed to run programs that interface directly with the underlying hardware, such as operating systems and device drivers.
Unlike Java, D does allow the programmer to overload operators. See operator overloading.
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