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Irrlicht Engine
Irrlicht EngineIrssi
IrssiIspell
IspellIw (Linux)
Jabber
Jahshaka
Jaspersoft BI
Jcode.pl
Jekyll
Jekyll (software)Jigdo
JigdoJitsi
JitsiJOnAS
Jq (プログラミング言語)
JRuby
JRubyJSDoc
JSDocJuK
JuKJython
JythonKAlarm
KAlarmKali Linux
Kali LinuxKaTeX
KaTeXKawa
Kawa (Scheme implementation)KBabel
KCharSelect
KColorEdit
KColorEditKControl
KDE
KDEKDE Applications
KDE GearKDE Frameworks
KDE Frameworks