D (programming language)
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There have been several programming languages called D during the history of computing. (This needs elaboration.)
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 can be found at http://www.digitalmars.com/d/index.html