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http://www.cplusplus.com/info/compilers/#freeFree compilers
Borland C++ 5 Free Compiler
This is a free release of the 32-bit Borland C++ Builder compiler but limited to the command-line tools, without the Development Environment nor any other extra tools or visual component that comes with the commercial package. It is capable of building native Windows applications and it is ANSI-C++ compatible.
Platforms: Windows 9x/Me, Windows NT/2000
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Borland C++ Free Compiler
Borland C++ compiler command-line tools
Free
GNU GCC based compilers
GCC is a multi-language compiler originally designed for UNIX-like systems that can compile C++ code. It is available for certain UNIX systems and it is included in almost every Linux distribution. Currently there are also some ports of this compiler for other platforms.
These compilers may generally be obtained free of charge under the terms of the GNU General Public Licence.
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GCC
Original GNU Compiler Collection (GCC)
Free
mingw
GCC Port that can build native MSWindows' executables.
Free
Bloodshed Dev-C++
Development environment for Windows based on mingw packages.
Free
Cygwin
Tools to build Windows applications over a UNIX-like DLL layer (cygwin.dll).
Free
djgpp
GCC Port to compile DOS and DOS+DPMI programs, including development tools.
Free
RSXNT
Extensions to compile Windows Apps for certain DOS compilers, like djgpp.
Free
Digital Mars
Successor of Zortech/Symantec C++ and brought to you by its original developer Walter Bright, this compiler and companion tools support development for DOS, extended DOS, Win16 and Win32 platforms.
Zortech compiler, and now Digital Mars, are known to be the fastest C++ compilers in terms of compiling/linking time.
Platforms: DOS, DOS32, Win16, Win32
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Digital Mars
Digital Mars C++ compiler and tools
Free