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/

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

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

Input extension headers

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/

Object-oriented SGML/XML parser toolkit and DSSSL engine

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

JavaBeansTM Activation Framework

http://java.sun.com/products/javabeans/jaf/

JAGS - Just Another GTK+ Samba Client

http://jags.sourceforge.net

High performance image processing libraries for Java

http://java.sun.com/products/java-media/jai/

A library for generating Java bytecode

http://jakarta.apache.org/bcel/

Java library for command line arguments and options

http://jakarta.apache.org/commons/cli/

Implementations of common encoders and decoders

http://jakarta.apache.org/commons/codec/

Package implementing the client side of the HTTP standard

http://jakarta.apache.org/commons/httpclient/

Generic logging wrapper library

http://jakarta.apache.org/commons/logging/

Regular expressions for Java

http://jakarta.apache.org/regexp/

Apache Struts framework

http://struts.apache.org

Build utility like make(1)

http://www.perforce.com/jam/jam.html

Compact Java virtual machine

http://jamvm.sourceforge.net/

C library for encoding, decoding, and manipulating JSON data

http://www.digip.org/jansson/

Implementation of the codec specified in the JPEG-2000 standard

https://www.ece.uvic.ca/~frodo/jasper/

Updated Java timezone definitions

Reference Implementation of JSR 919

https://javaee.github.io/javamail/

Wrapper script for various Java Virtual Machines

Java XPath Engine

https://jaxen.org