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/

Time synchronization over http utility

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

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

http://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/

Iagno

https://wiki.gnome.org/Iagno

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, usability and consistency

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)

http://site.icu-project.org/

Place launch icons and background directly on your desktop

http://idesk.sourceforge.net

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

The next generation graphics library for Enlightenment

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

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

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

Replacement for IntelliJ's fsnotifier

https://github.com/idea4bsd/fsnotifier/

FreeBSD-compatible replacement for IntelliJ's bundled Pty4J

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

http://itstool.org/

Online presence and instant messaging server

https://jabberd2.org/

Low latency audio server

https://jackaudio.org/

Object-oriented SGML/XML parser toolkit and DSSSL engine

http://www.jclark.com/jade/