| J-League: Winning Goal | Stardust Crusaders | Sports | NES | Fully Playable | 1.0 | 24 May 2009 | EN |
| J.League Live 64 | Zoinkity | Sports | N64 | Fully Playable | 1.0 | 21 Aug 2018 | EN |
| Jabberwock no Hanayome | Non-Directional Translations | Action > Shooter | PC | Fully Playable | 1.0 | 16 Apr 2007 | EN |
| Jajamaru Gekimaden: Maboroshi no Kinmajou | Ethereal Productions | Role Playing > Action RPG | NES | Unfinished | 0.10 | 15 Apr 2000 | EN |
| Jajamaru Gekimaden: Maboroshi no Kinmajou | Stardust Crusaders, aishsha | Role Playing > Action RPG | NES | Fully Playable | 1.0 | 08 Nov 2009 | EN |
| Jajamaru Gekimaden: Maboroshi no Kinmajou | Proveaux | Role Playing > Action RPG | NES | Addendum | 1.01 | 07 Apr 2016 | EN |
| Jajamaru Ninpou Chou | Stardust Crusaders, aishsha | Role Playing | NES | Fully Playable | 1.0 | 15 Aug 2018 | EN |
| Jajamaru no Daibouken | Stardust Crusaders, aishsha | Action > Platformer | NES | Fully Playable | 1.0 | 10 Mar 2010 | EN |
| Janggun ui Adeul | pacnsacdave | Action > Fighting | NES | Fully Playable | 1.0 | 29 Jun 2015 | EN |
| Jelly Boy 2 | KingMike's Translations | Action > Platformer | SNES | Fully Playable | 1.0 | 16 Oct 2006 | EN |
| Jesus: Kyoufu no Bio Monster | Stardust Crusaders | Adventure | NES | Fully Playable | 3 Days Later Edition Rev 2 | 15 Aug 2016 | EN |
| Jikkyou Power Pro Wrestling '96 - Max Voltage | Phil | Action > Fighting | SNES | Unfinished | 1.0 | 05 Jan 2008 | EN |
| Jikuu Yuten: Debias | Gil Galad | Role Playing > Action RPG | NES | Fully Playable | 1.0 | 26 Aug 2011 | EN |
| Jing Hua Yuan | pacnsacdave | Action > Platformer | NES | Fully Playable | 1.0 | 04 Jul 2017 | EN |
| JJ: Tobidase Daisakusen Part II | DvD Translations | Action | NES | Fully Playable | 1.00 | 14 Nov 2003 | EN |
| Jojo no Kimyou na Bouken | Aeon Genesis | Role Playing | SNES | Fully Playable | 1.00 | 13 Apr 2013 | EN |
| JoJo no Kimyou na Bouken: Ougon no Kaze | JoJo's Colored Adventure | Action > Beat 'Em Up | PS2 | Fully Playable | 1.0 | 20 Oct 2018 | EN |
| Joy Mech Fight | AlanMidas | Action > Fighting | NES | Fully Playable | joy.mech | 15 Dec 2000 | EN |
| Jump Ultimate Stars | JUS Translation | Action > Fighting | NDS | Fully Playable | 03/05/08 | 03 May 2008 | EN |
| Just Breed | obsolete translation | Strategy > Turn Based | NES | Unfinished | 0.001 beta | 11 Jul 2000 | EN |
