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

http://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://www.ivrix.org.il/projects/spell-checker/

All W3C published SGML DTDs for HTML

Converts HTML documents into plain text

http://userpage.fu-berlin.de/~mbayer/tools/html2text.html

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/

HTTP request/response parser written in C

https://github.com/nodejs/http-parser

A tool for measuring webserver performance

http://code.google.com/p/httperf/

Fuse-based http filesystem

https://httpfs.sourceforge.net/

Improved spell-checker for Hungarian and other languages

http://hunspell.sourceforge.net/

Probe for hardware, check operability, and finding drivers

https://bsd-hardware.info/

Database of IDs used in PCI, PNP and USB devices

https://github.com/vcrhonek/hwdata

Portable Hardware Locality software package

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

Portable Hardware Locality software package

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

Command line tool to display CPU temp and battery infos

https://BSDforge.com/projects/sysutils/hwstat/

Program to generate a cross-referenced HTML mail archive

http://www.hypermail-project.org

Library for high quality hyphenation and justification

http://hunspell.sourceforge.net

Hyprland graphics / resource utilities

https://github.com/hyprwm/hyprgraphics

Wayland protocol extensions for Hyprland

https://github.com/hyprwm/hyprland-protocols

Official implementation library for the hypr config language

https://wiki.hypr.land/Hypr-Ecosystem/hyprlang/

Hyprland utilities library used across the ecosystem

https://github.com/hyprwm/hyprutils

Hyprland implementation of wayland-scanner

https://github.com/hyprwm/hyprwayland-scanner

Fast and consistent wire protocol for IPC

https://github.com/hyprwm/hyprwire

Heterogeneous set of I2C tools

https://i2c.wiki.kernel.org/index.php/I2C_Tools

Improved dynamic tiling window manager

https://i3wm.org

Enhanced i3lock with higher capacity

https://github.com/Raymo111/i3lock-color

Thermal and C-state reporting utility for Intel Core CPUs

https://github.com/DimitryAndric/i7z

Restricted unix shell

http://ibsh.sourceforge.net/

Intelligent Input Bus for Linux / Unix OS

http://code.google.com/p/ibus

Anthy engine for IBus

https://github.com/ibus/ibus-anthy

Chewing engine for IBus

https://github.com/definite/ibus-chewing

PinYin engine for IBus

http://code.google.com/p/ibus

IBus engine for Rime users

https://github.com/rime/ibus-rime/

Japanese SKK input engine for IBus

https://github.com/ueno/ibus-skk

Canna connector for yc.el via unix domain socket

http://www.ceres.dti.ne.jp/~knak/yc.html

Adobe ICC CMYK and RGB profiles for graphics professionals

https://supportdownloads.adobe.com/detail.jsp?ftpID=4075

ICE authority file utility for X

Window Manager designed for speed, usability and consistency

http://www.icewm.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/

Charset conversion library and utilities

Additional charsets for the iconv library (those from the Unicode site)