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 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/

Charset conversion library and utilities

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

Additional charset modules for the iconv library (from RFC1345)

Convert/extract images in Microsoft Windows(R) icon/cursor files

https://www.nongnu.org/icoutils/

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/

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/

Next generation graphics library for Enlightenment

https://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/

Monospaced TrueType font with Cyrillic glyphs

https://github.com/DeLaGuardo/Inconsolata-LGC

Monospaced truetype font

https://fonts.google.com/specimen/Inconsolata

Handle filesystem-events the way cron handles time ones

https://inotify.aiken.cz/?section=incron&page=about

Utility to regenerate the GNU info page index

https://github.com/bapt/indexinfo

GNUstep screensaver

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

10 gigabit FreeBSD Base Driver for Intel(R) Network Connections

https://downloadcenter.intel.com

Hardware video decoding/encoding/filtering on Intel GPUs

http://mediasdk.intel.com/

IntelliJ IDEA Community Edition

https://www.jetbrains.com/idea/

Replacement for IntelliJ's fsnotifier

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

Pty4J's native library

https://github.com/traff/pty4j

Free X11 fonts for all characters that Emacs can handle

Tools to internationalize various kinds of data files

http://www.gnome.org/

Slender monospace sans-serif and slab-serif typeface for programming

https://typeof.net/Iosevka/

Performance Test of Sequential File I/O

https://www.iozone.org/

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

https://www.iozone.org/

Tools for IP based Geo-blocking and Geo-routing

https://cyclaero.github.io/ipdb/

Tool to measure maximum TCP and UDP bandwidth

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

Official DShield client for ipfilter firewall logs

http://www.dshield.org/linux_clients.php#freebsd

DShield client for ipfw logs

http://www.dynamical-systems.org/ipfw/

Software package for large-scale nonlinear optimization

https://projects.coin-or.org/Ipopt

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/

Font by John Stracke based on the Isabella Breviary

https://www.thibault.org/fonts/isabella/

Kernel module enabling iSCSI/IBFT boot

https://github.com/jnielsendotnet/isboot

ISC Cron, former Vixie Cron

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

The ISC Dynamic Host Configuration Protocol client

https://www.isc.org/dhcp/