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Free C++ IDE

Anjuta
An Integrated Development Environment (IDE) for C and C++ on GNU/Linux. It has been written for GTK/GNOME and features a number of advanced programming facilities. These include project management, application wizards, an on-board interactive debugger, and a powerful source editor with source browsing and syntax highlighting.

Quincy 2005
Quincy 2005 uses only open-source software, in particular the MingW C/C++ compiler, and the GDB debugger. With Quincy you can develop Console C or C++ applications, Win32 GUI applications, DLLs, or static libraries. Quincy 2005 adds WinBGIm graphics and FLTK GUI applications, The included koolplot 2D plotting library is of special value to scientists and engineers.

Code::Blocks
An open-source cross-platform Integrated Development Environment (IDE) for C/C++.

BVRDE
BVRDE is an Integrated Development Environment (IDE) for C and C++. It is designed to make cross-platform development easy. Its features include project management, application wizards, an integrated interactive debugger, and a powerful source editor with source browsing and syntax highlighting. It runs on a Windows NT platform and connects to almost any UNIX / LINUX system. It requires Windows 2000 or better installed, but all the development tools (compiler, linker, debugger) should be located on the remote system.

Visual-MinGW
Visual-MinGW is an Integrated Development Environment devoted to MinGW compiler system. It provides an easy to use Open Source front end to create your own C/C++ Windows applications.

Rhide
An IDE for DJGPP and other GNU based systems.

Quincy99 IDE
Quincy 99 is an Integrated Development Environment front end for C/C++ compilers. As currently configured, Quincy 99 works with the Mingw32 port of the GCC C/C++ compiler suite. Requires Windows 95/98/NT/2000.

The V IDE for GNU C++ and Java
V is a free, multiple platform C++ gui framework designed to make it the easiest way to write C++ GUI applications available. V is available for X Athena, X Motif/Lesstif, all Windows platforms, and now including OS/2.

KDevelop
C/C++ IDE for Unix publicly available under the GPL.