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 iaPil - Peter Mark Garza 
Ibraang - Neal J. Roberts 
Ibran - Muke Tever 
Idjana - Quentin Read 
Ido - Louis de Beaufront, Louis Couturat 
Idrani - T. Mitchell Pehrson 
Igmerind - Patrick Pfeaster 
Igrejan - A. Mendes 
Ii42hah32reh12man41 - Jonathana Tegire and Jaaaaaa 
Iju Puna - Kevin Goodman 
Ikanirae Seru - Estel Telcontar 
Iksto - Keith Mitchell 
Ilaini - Irina Rempt 
Ilathid'hi - Scott 'Blade' Hamilton 
Ilianóre - Jeff Smith 
Ilish - Jeffrey Henning 
Iljanore - Jeff Smith 
Ilkorin - J.R.R. Tolkien 
Illanī - Drydic_Guy 
Illfillin - Uskokovic Vuk 
Iltârer - Tom Little (Sêsâmân) 
Ilythirri Alurl - Jashan A'al 
Imuttan - Kári Emil Helgason 
Inagalasi - civman2000 
Inda - Gregory Higley 
Indika - Nikhil Sinha 
Indo-Nugimian - Tony Le 
Ini - Nicole Perrin 
inif Xeuivteles - B. Morgan White 
Inkliche - Stefan Lubbersen 
Ïnlici - ACZ 
Inrilan - The Inrilan Consortium 
Intal - Erich Weferling 
Inter Celtic - Makeenan 
Inter-esperanto - Greg Hoover, Initiator 
Intergermansk - Pascal A. Kramm 
Interglossa - Lancelot Hogben 
InterLang - Douglas Green, Kristian Jarventaus, Kevin Albrecht 
Interlingua - International Auxiliary Language Association 
Interlingue 
Intermythic English - Jeffrey Henning 
International Sign Language (ISL) - World Congress of the World Federation of the Deaf 
Intero - Marq Thompson and Jon 
Ïpetas - Tuomo Sipola 
Ipsilikhthar - Herman Miller 
Iqalu - Zach McVaY 
Irecepte - Eric Remington 
Irsawa - Andrew Lai 
Isirian - Joshua Horn 
Islandian - Austin Tappan Wright 
Islet - Daniel Myers 
Islic Wood Elvish - Curtis Mullings 
Ismain - Mark Rosenfelder 
Isotype - Otto Neurath 
it-Cejdijtung, Ctung - Anthony Lawless, Evan Gallagher, Jan Havliš, Jim Morgan 
Ithkuil - John Quijada 
Itlani - James E. Hopkins 
Ivrien - Geoff Eddy 
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