D is a general purpose systems and applications programming language.

The D programming language by Walter Bright, see http://www.digitalmars.com/d/

It is a higher level language than C++, but retains the ability to write high performance code and interface directly with the operating system API's and with hardware. DMD is the Digital Mars D compiler, available for Windows and Linux (x86).

The GNU D Compiler (GDC) is based on the GNU Compiler Collection (GCC)

D front-end for GCC by David Friedman, see http://home.earthlink.net/~dvdfrdmn/d/

You can run programs created with GDC on any Mac OS X machine (no special run-time libraries required) It is also possible to link with programs created by the usual Xcode Tools versions of GNU C Compiler (gcc) and GNU C++ Compiler (g++).

Download GDC 0.17 for Mac OS X, based on DMD 0.140 and released on Dec 02 2005:

Testing:
 GDC 0.17 for Tiger (Universal) (PowerPC or Intel) based on GCC 4.0.1, 10.2 MB
 This package contains powerpc-apple-darwin8-gdc and i686-apple-darwin8-gdc for Mac OS X 10.4

Released:
 GDC 0.17 for Tiger (Mac OS X 10.4, Xcode Tools 2.2) based on GCC 4.0.1, 3.2 MB
 GDC 0.17 for Panther (Mac OS X 10.3, Xcode Tools 1.5) based on GCC 3.3.6, 2.4 MB

Deprecated:
 GDC 0.17 for Jaguar (Mac OS X 10.2, Dec 2002 Dev Tools) based on GCC 3.3.6, 2.4 MB
 GDC 0.17 for Puma (Mac OS X 10.1, Dec 2001 Dev Tools) not available nor supported

You need to have regular Xcode Tools already installed, in order to use this GDC package. See also GDC with Xcode for how to use the Xcode IDE with D language. Or do you need some additional help,  Getting Started with GDC ? If you don't like Installers, Zip files (and source code) are available too

GDC is Free Software, released under the GNU General Public License (GPL)

Free Software grants you four basic freedoms: (see also the License Agreement)

• Freedom to use the program, for any purpose.
• Freedom to study how the program works and to adapt it to your needs (source code access).
• Freedom to copy and distribute (you can help your neighbour).
• Freedom to improve the program and make the enhancements available so all the community benefits.