| [M4](http://www.gnu.org/software/m4/m4.html) | GNU M4 is an implementation of the traditional Unix macro processor. It is mostly SVR4 compatible although it has some extensions (for example, handling more than 9 positional parameters to macros). GNU M4 also has built-in functions for including files, running shell commands, doing arithmetic, etc. |
## Lang
| Module | Description |
| ------ | ----------- |
| [Bison](http://www.gnu.org/software/bison) | Bison is a general-purpose parser generator that converts an annotated context-free grammar into a deterministic LR or generalized LR (GLR) parser employing LALR(1) parser tables. |
| [flex](http://flex.sourceforge.net/) | Flex (Fast Lexical Analyzer) is a tool for generating scanners. A scanner, sometimes called a tokenizer, is a program which recognizes lexical patterns in text. |
## Lib
| Module | Description |
| ------ | ----------- |
| [zlib](http://www.zlib.net/) | zlib is designed to be a free, general-purpose, legally unencumbered -- that is, not covered by any patents -- lossless data-compression library for use on virtually any computer hardware and operating system. |
## Tools
## Tools
| Module | Description |
| Module | Description |
| ------ | ----------- |
| ------ | ----------- |
| [binutils](http://directory.fsf.org/project/binutils/) | binutils: GNU binary utilities |
| [EasyBuild](https://easybuilders.github.io/easybuild) | EasyBuild is a software build and installation framework written in Python that allows you to install software in a structured, repeatable and robust way. |
| [EasyBuild](https://easybuilders.github.io/easybuild) | EasyBuild is a software build and installation framework written in Python that allows you to install software in a structured, repeatable and robust way. |
| [help2man](https://www.gnu.org/software/help2man/) | help2man produces simple manual pages from the '--help' and '--version' output of other commands. |
