Digital Mars is a small American software company owned by Walter Bright and based in Vienna, Virginia. It makes C, C++, and D compilers, and associated utilities such as an integrated development environment (IDE) for Windows and DOS, which Digital Mars calls an integrated development and debugging environment (IDDE).^[1]

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The compilers can be downloaded, free of charge, from Digital Mars's web site.^[2] Product names changed over time. The C compiler was first named Datalight C compiler, then Zorland C, then Zortech C, then Digital Mars C/C++ compiler. The C++ compiler was first named Zortech C++, then Symantec C++, then Digital Mars C++ (DMC++).

The company gained notice in the software development community for creating the D programming language. D resulted from Bright's frustration with the direction of the C++ language and from his experience implementing it.^{[citation needed]} Digital Mars is also notable for having shipped the first commercial C++ compiler for Windows^[3]

In 2002, Digital Mars released DMDScript, an ECMA-262-compliant JavaScript engine, written in D.^{[citation needed]}

In 1988, Zortech was the first C++ compiler to ship for Windows. PC Magazine ran a graphics benchmark, and reported that most executables produced by Zortech ran faster than executables produced by Microsoft C 5.1 and by Watcom C 6.5.^[3] Stanley B. Lippman wrote that Zortech was the first C++ compiler to implement return value optimization. Later, the C++ standard required this.^[4]

In 2023, Mike Engelhardt released a new simulator QSPICE, which uses this compiler on the backend to allow for C++ and Verilog authored behavioral simulation models to be compiled to native code and loaded by the simulation environment.^[5][6]