Compression utility designed to be a replacement for compress

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

gzip recovery toolkit

https://www.urbanophile.com/arenn/hacking/gzrt/

Hardware Abstraction Layer for simplifying device access

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

Additional FDI files to further classify HAL devices

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

OpenType text shaping engine

https://harfbuzz.github.io/

Harfbuzz ICU support

https://harfbuzz.github.io/

Anti-spam / denial of service counter-measure tool

http://www.hashcash.org/

Hierarchical Data Format library (from NCSA) (latest)

https://www.hdfgroup.org/

Portable and enhanced troff, nroff, and related utilities

https://n-t-roff.github.io/heirloom/doctools.html

Automatically generating simple manual pages from program output

https://www.gnu.org/software/help2man/

Online help viewer for GNUstep programs

http://www.roard.com/helpviewer/

High-color icon theme shell from the FreeDesktop project

http://www.freedesktop.org/Standards/icon-theme-spec

Customizable syntax highlighter

http://www.andre-simon.de/

Framework needed by Project Manager

http://home.gna.org/pmanager/

Utility primarily designed to find the owner of an IP block

Hitori

https://wiki.gnome.org/Apps/Hitori

IEEE 802.11 AP, IEEE 802.1X/WPA/WPA2/EAP/RADIUS Authenticator

https://w1.fi/hostapd/

Small utility which displays the system activity in a very special way

http://dindinx.net/hotbabe/

Network auditing tool

http://www.hping.org/

Hebrew spellchecker and morphology engine

http://hspell.ivrix.org.il

All W3C published SGML DTDs for HTML

Converts HTML documents into plain text

https://gitlab.com/grobian/html2text

Time synchronization over http utility

https://github.com/twekkel/htpdate

Tool for measuring webserver performance

https://github.com/httperf/httperf

Improved spell-checker for Hungarian and other languages

https://hunspell.github.io/

Portable Hardware Locality software package

https://www.open-mpi.org/projects/hwloc/

Library for high quality hyphenation and justification

https://github.com/hunspell/hyphen

Iagno

https://wiki.gnome.org/Iagno

Restricted unix shell

http://ibsh.sourceforge.net/

ICE authority file utility for X

Window manager designed for speed and usability

https://ice-wm.org/

Displays a wire-frame rotating plyhedron

https://gitlab.freedesktop.org/xorg/app/ico

Utilities of the Tango project

http://tango-project.org/

Basic set of icons for the most common usage

http://tango.freedesktop.org/

Extra set of icons from the Tango project

http://tango-project.org/

International Components for Unicode (from IBM)

https://icu.unicode.org/

Library to handle internationalized domain names

https://www.nic.ad.jp/ja/idn/idnkit/download/

Internet Low Bit Rate codec (RFC3951)

http://www.ilbcfreeware.org/

GNUstep Image Viewer

https://www.nice.ch/~phip/softcorner.html

Imake and other utilities from X.Org

https://www.x.org/

Palm Pilot Image Viewer to PGM Converter

Publishing and presentation tool

https://www.ntlug.org/~ccox/impress/

Dynamic DNS update client

https://troglobit.com/projects/inadyn/

Utility to regenerate the GNU info page index

https://github.com/bapt/indexinfo

GNUstep screensaver

https://www.nongnu.org/gap/innerspace/index.html

Replacement for IntelliJ's fsnotifier

https://gitlab.com/worthwhileit/bsd/fsnotifier

Pty4J's native library

https://github.com/traff/pty4j

Tools to internationalize various kinds of data files

http://www.gnome.org/

Performance Test of Sequential File I/O

https://www.iozone.org/

Performance Test of Sequential File I/O (older version)

https://www.iozone.org/