- Emacs Common Lisp
- Emacs Common Lisp is an implementation of Common Lisp, written in Emacs Lisp. The implementation provides a Common Lisp environment, separate from Emacs Lisp, running in Emacs. It does not intend to extend Emacs Lisp with Common Lisp functionality; however, Emacs Lisp functions can call Common Lisp functions and vice versa.
- Fortran 77 compiler based on the original Unix f77 compiler, with the backend replaced by a C code generator.
- Free Oberon
- Free Oberon is a cross-platform IDE for development in Oberon programming language made in the classical FreePascal-like pseudo-graphic style. Compilation of user-written programs is performed using the Vishap Oberon Compiler and then GCC. The compiled console programs can be run in the built-in terminal emulator.
- FreeBASIC is a compiler for the FreeBASIC programming language, a dialect of BASIC which is partially compatible with Microsoft QuickBASIC. It makes use of the GNU binutils and can compile itself.
- FreePascal (aka FPK Pascal) is a 32 and 64 bit bit Pascal compiler with extensions for different processors and operating systems. It tries to stay compatible with the dialects of well known proprietary Pascal-based compilers, so you don't have to learn much to switch to free software and/or systems. The language syntax is semantically compatible with TP 7.0 as well as most versions of Delphi (classes, rtti, exceptions, ansistrings). FreePascal supports function overloading, operator overloading and other such features. It also comes with several command-line tools to help your programming, including a source formatter, a makefile generator, a C header translator, a unit dependency lister and even TP lex and yacc. FreePascal comes with its own development environment (not for all platforms yet).
- Frost is a compiler wrapper which makes it possible to use functions with virtual arguments and multi methods in C++ programs as if they were a native feature.
- g++ is the traditional nickname of GNU C++, a freely redistributable C++ compiler. It is part of gcc, the GNU compiler suite, and is currently part of that distribution.
- Decommissioned note:
- GNU Fortran compiler.
- The Gnu Data Language (GDL) is a free alternative to the data visualization and analysis tool, called IDL (Interactive Data Language), frequently used by scientists. GDL and its library routines are designed as a tool for numerical data analysis and visualisation. GDL is dynamically typed, vectorized and has object-oriented programming capabilities. The library routines handle numerical calculations, data visualisation, signal/image processing, file input/output (incl. graphical and scientific data formats such as TIFF, PNG, netCDF, HDF etc) and interaction with host OS. Despite its name, GDL is not a GNU package.
- GCC is the GNU Compiler Collection. It provides compiler front-ends for several languages, including C, C++, Objective-C, Fortran, Java, Ada, and Go. It also includes runtime support libraries for these languages. GCC provides many levels of source code error checking traditionally provided by other tools (such as lint), produces debugging information, and can perform many different optimizations to the resulting object code. The GNU Compiler for Java is now integrated and supported: GCJ can compile Java source or Java bytecodes to either native code or Java class files. Java programs will run faster while letting users run a completely free system without needing a proprietary Java compiler. GCC supports many different architectures and operating systems.
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