A general-purpose parser generator that converts a grammar description for an LALR context-free grammar into a C program to parse that grammar. [Open source, GPL]

A fast lexical analyser generator. It is a tool for generating programs that perform pattern-matching on text. There are many applications for Flex, including writing compilers in conjunction with GNU Bison. [Open source, GPL]

An initiative to create an open source implementation of the .NET runtime and related development tools.

A graphical X Window front-end for command-line debuggers such as GDB, DBX, WDB, Ladebug, JDB, XDB, the Perl debugger, or the Python debugger.

Provides several frameworks to render 3D graphics in a GNUstep environment. Its main purpose is to render any kind of 3D graphics in real-time on commodity hardware, using an optimised scene graph architecture.

GNU ncurses includes an Ada 95 binding.

The package is intended to translate Algol 60 programs to the C programming language.

MIX Development Kit, emulates MIX, MIXAL; with compiler, virtual machine, GUI, Guile interpreter, Emacs mode, Elisp program to run programs in Emacs window.

Official homepage at GNU site.

Effective AWK Programming