Gutenprint Printer Drivers

https://gimp-print.sourceforge.net/

PostScript and PDF previewer

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

GNOME virtual file system

http://www.gnome.org/

Libraries module for the GVM solution

https://github.com/greenbone/gvm-libs

GNUstep workspace manager

http://www.gnustep.it/enrico/gworkspace/

GWMetadata for GNUstep workspace manager

http://www.gnustep.it/enrico/gworkspace/

Command line tool of Yahoo! Dictionary

https://github.com/iamgyz/gydict

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/

Typeface designed for source code

https://sourcefoundry.org/hack/

Library of matchers for building test expressions

http://hamcrest.org/

Shared libraries for Amateur Radio Equipment Control Applications

https://sourceforge.net/projects/hamlib/

HAMMER2 file system for FreeBSD (experimental write support)

https://github.com/kusumi/freebsd_hammer2

CJK Mincho-typeface developed by Hanazono University

http://fonts.jp/hanazono/

OpenType text shaping engine

https://harfbuzz.github.io/

Harfbuzz Cairo support

https://harfbuzz.github.io/

OpenType text shaping engine

https://harfbuzz.github.io/

Anti-spam / denial of service counter-measure tool

http://www.hashcash.org/

Hanzi Converter -- converts between GB and BIG-5 codes

Hierarchical Data Format library (from NCSA)

https://www.hdfgroup.org/

Hierarchical Data Format library (from NCSA) 1.10.x

https://www.hdfgroup.org/

Portable and enhanced troff, nroff, and related utilities

http://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/

Monospaced font for programmers by a programmer

https://pcaro.es/p/hermit/

Tiny program that sends some load to a web application

https://github.com/rakyll/hey

HFSExplorer read Mac-formatted harddisks and disk images

https://www.catacombae.org/hfsexplorer/

FUSE driver for HFS+ filesystems

https://github.com/0x09/hfsfuse

Utilities for accessing Apple's HFS volumes

https://www.mars.org/home/rob/proj/hfs/

High-color icon theme shell from the FreeDesktop project

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

Library to access USB HID-class devices

https://github.com/libusb/hidapi

Nintendo multi-system emulator

http://byuu.org/higan/

Customizable syntax highlighter

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

Framework needed by Project Manager

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

Solver for large scale sparse linear programming (LP) problems

https://github.com/ERGO-Code/HiGHS

Performance-portable, length-agnostic SIMD with runtime dispatch

https://github.com/google/highway

Stacking Wayland compositor with tiling capabilities

https://hikari.acmelabs.space

Minimalistic C client library for the Redis database

https://github.com/redis/hiredis

Hitori

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

Hyper NIKKI System, a CGI system for Electric Diary Interchange

http://www.h14m.org/

Split files into encrypted fragments

https://github.com/jesseduffield/horcrux

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

http://www.mbayer.de/html2text/

Better top(1) - interactive process viewer

https://htop.dev/

Time synchronization over http utility

http://www.vervest.org/htp/

HMM-based speech synthesis system (HTS) engine and API

https://hts-engine.sourceforge.net/