Utility primarily designed to find the owner of an IP block

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/

Library for building UPnP devices and control points

http://hupnp.linada.fi/

Portable Hardware Locality software package

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

Library for high quality hyphenation and justification

https://github.com/hunspell/hyphen

32bit Microsoft Windows compatibility environment for 64bit BSD

http://www.winehq.org/

Restricted unix shell

http://ibsh.sourceforge.net/

Intelligent Input Bus for Unix-like systems

https://github.com/ibus/ibus

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/

Place launch icons and background directly on your desktop

https://idesk.sourceforge.net

Library to handle internationalized domain names

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

ILM Base libraries a.k.a. Half, IlmThread, Imath, and Iex

http://www.openexr.com/

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

Next generation graphics library for Enlightenment

https://docs.enlightenment.org/api/imlib2/html/

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

Input extension headers

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/

Tool to measure maximum TCP and UDP bandwidth

https://sourceforge.net/projects/iperf2/

KAME racoon IKE daemon, ipsec-tools version

http://ipsec-tools.sourceforge.net/

High performance realtime 3D engine

http://irrlicht.sourceforge.net/

Modular IRC client with many features

https://irssi.org/

Collection of useful scripts for the irssi IRC-client

https://scripts.irssi.org/

Collection of additional irssi themes

https://irssi-import.github.io/themes/

ISC Cron, former Vixie Cron

ftp://ftp.isc.org/isc/cron/

Lists of the country, language, and currency iso names

https://salsa.debian.org/iso-codes-team/iso-codes

Character entity sets from ISO 8879:1986 (SGML)

Make XML documents translatable through po files

https://itstool.org/

Online presence and instant messaging server

https://jabberd2.org/