The GNU Autoconf Archive is a collection of more than 450 macros for GNU Autoconf. They can be re-used without imposing any restrictions on the licensing of the generated configure script. In particular, it is possible to use them in configure scripts that are meant for non-free software.
JavaAutotoolsExample is an example of a Java Swing program that uses GNU Gettext, Autoconf, Automake, Make, and Java JNI. JavaAutotoolsExample is intended to help Java developers and maintainers make their full-featured Java programs respect the standard "./configure && make && sudo make install" procedure for build and installation.
GNU GLOBAL source code tag system is a source code tagging system which works the same way across diverse environments (Emacs, vi, less, bash, Web browser, etc.). It can locate objects in source files and move there easily. It is useful for hacking a large project containing many subdirectories, many #ifdefs, and many main() functions. It is similar to ctags or etags, but is independent of any editor.
yuck is a command line option parser for C that works on a minimal set of dependencies - only a C compiler and the m4 macro processor are required. It supports all the standard use cases: GNU-style long options (--option), condensable short options (-xab for -x -a -b), and optional arguments to long and short options (--foo[=BAR]), multiple occurrence of options (-vvv). Most importantly, it does not depend on libc's getopt() nor getopt_long().