GNU find utilities

https://www.gnu.org/software/findutils/

Wrapper scripts for firefox web browser

Remote firewall auditing tool

http://www.packetfactory.net/firewalk/

Fixes extension headers

http://www.freedesktop.org/wiki/Software/xlibs

Patch making it possible to embed PNGs into RTFs

Free lossless audio codec

https://www.xiph.org/flac/

Backup content from any volume to a tarball

https://github.com/laffer1/flashback/

Fast lexical analyzer generator

https://github.com/westes/flex

Small run-time speech synthesis engine

http://www.festvox.org/flite/

Manage locks from shell scripts

https://www.kernel.org/pub/linux/utils/util-linux/

Floating point benchmark to give your MFLOPS rating

http://performance.netlib.org/performance/html/flops.html

Legacy FreeBSD pmake

Create an index of X font files in a directory

https://www.x.org/

Fontcache extension headers

http://www.freedesktop.org/Software/xlibs

XML-based font configuration API for X Windows

https://www.freedesktop.org/wiki/Software/fontconfig/

Fonts extension headers

http://www.x.org/

Database for integrating printer drivers with common spoolers

http://www.linuxfoundation.org/collaborate/workgroups/openprinting/database/foomatic

Foomatic database engine

http://www.linuxprinting.org/foomatic.html

Foomatic data for the HPIJS printer drivers

http://www.linuxprinting.org

Quickly ping N hosts w/o flooding the network

http://www.fping.org/

Sound theme based on the FreeDesktop specification

http://freedesktop.org/wiki/Specifications/sound-theme-spec

Sybase/Microsoft TDS protocol library

http://www.freetds.org/

Free and portable TrueType font rendering engine

https://www.freetype.org/

Free Implementation of the Unicode Bidirectional Algorithm

http://fribidi.org/

Command line FTP tools for listing and mirroring

https://www.ohse.de/uwe/ftpcopy.html

Synchronizes a local and a remote FTP directory trees

http://www.clazzes.org/ftpsync

Utility to display the HTTP headers returned by web-servers

https://github.com/bingos/furl

Graphical Boot Manager

Freedesktop compliant menu library

https://www.xfce.org/

GNU version of Awk

http://www.gnu.org/software/gawk/gawk.html

Eclipse Java Compiler used to build GCC Java

GNU Compiler Collection 3.4

http://gcc.gnu.org/

GNU Compiler Collection 4.6

http://gcc.gnu.org/

GNU Compiler Collection 4.7

http://gcc.gnu.org/

GNU Compiler Collection 4.8

https://gcc.gnu.org

Create dependencies in makefiles using 'gcc -M'

GNU copy-in/out (cpio)

http://www.gnu.org/software/cpio/

GNU GDB of newer version than comes with the system

http://sourceware.org/insight/

GNU database manager

https://www.gnu.org.ua/software/gdbm/

getopt(1) replacement that supports GNU-style long options

http://software.frodo.looijaard.name/getopt/

GNU gettext meta package

https://www.gnu.org/software/gettext/

Tools and library routines for working with GIF images

https://sourceforge.net/projects/giflib/

Manipulates GIF images and animations

http://www.lcdf.org/gifsicle/

Distributed source code management tool

https://git-scm.com/

OpenGL Extension Wrangler Library

http://glew.sourceforge.net/

Some useful routines of C programming (current stable version)

https://www.gtk.org/

Programming reference for devel/glib20

https://www.gtk.org/

GLX extension headers

http://www.freedesktop.org/wiki/Software/xlibs

GNU version of 'make' utility

https://www.gnu.org/software/make/

Minimalist version of gnu make

http://www.gnu.org/software/make/make.html