Arch Homepage. Contains download information and links.

GNU autoconf is a package for generating configure scripts. These scripts are present in a large number of free software packages and are used to detect system features at compilation time. Autoconf is mostly needed by people producing packages that r...

Freeware - Generates makefile.in files from makefile.am input files, as part of the official GNU coding standards and build process. Requires GNU autoconf.

Documentation of the Regular Expression syntax used in GNU Awk.

Official site for the GNU Bourne Again SHell. Includes manual and links to download bash binaries and source.

A free, scalable telecommunications application server by the GNU Project.

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]

The GNU C library is used as the C library in the GNU system and most newer systems with the Linux kernel.

GNU cflow analyzes a collection of C source files and prints a graph, charting control flow within the program. [Open source, GPL]

A free replacement for Sun's proprietary core Java class libraries. [Open Source, GPL with exception]