| J.G. the Magician | Baby Bonnie Hood ◪ | 2015-02-09 |
| 139 |
| J.G.'s Mini RPG Thingy | Baby Bonnie Hood ◪ | 2012-02-24 |
| 137 |
| J.G.'s Neatsome Magical Adventures | Baby Bonnie Hood ◪ | 2011-04-30 |
| 207 |
| Jack: Time to Save the World | Jason Weaver | 2000-03-16 |
| 105 |
| Jail Brake | Koji ◪ | 2000-06-26 |
| 102 |
| Jared 52 - Quantum Hell (ver. 1.1) | Giel ◪ | 2014-01-06 |
| 95 |
| Jay & Andrew vs. the Nazi Teacher Party (unfinished) (ver. 0.0) | misterhaan ◪ | 1997-09-05 |
| 102 |
| Jello | CHEZZY ◪ | 2006-08-12 |
| 175 |
| Jellybean | ZzCrook ◪ | 2004-02-14 |
| 103 |
| Jet Pack Man | T-Bone ◪ | 2004-05-17 | No reviews. | 126 |
| Jet Pack Man 2 Demo | T-Bone ◪ | 2004-06-20 | No reviews. | 98 |
| Jewel of Arc Teaser | LostOne ◪ | 2004-02-17 |
| 90 |
| Jiffy 1-4 | Joel Smith | 1997-01-25 |
| 102 |
| Jimmy Caca's Quest | Jairska | 1995-12-03 | No reviews. | 39 |
| Jimmy Demo | Slinky Games | 2004-02-12 |
| 100 |
| Jimmy's Little Quest | Jairska | 1997-02-01 | No reviews. | 26 |
| Joe and the Wandering Targets | acheron ◪ | 2000-08-13 |
| 114 |
| Joe Beans 1: Flight (GM's unreleased indev 001) | iamgreaser ◪ | 2010-06-17 | No reviews. | 78 |
| Joe Beans in Flight | CJA / Greasemonkey / Kom | 2009-03-07 | No reviews. | 106 |
| Joe Shmoe: Savior of Shoes (Demo) | Nahah ◪ | 2006-01-14 |
| 81 |
| Joey's World | Bluep4 ◪ | 2002-08-27 |
| 107 |
| Joey's World 2 | Bluep4 ◪ | 2002-09-20 |
| 117 |
| Johnny Pest | Robert Bloom | 1998-03-20 |
| 107 |
| Jonah Demo | Bramble ◪ | 2004-12-16 |
| 92 |
| Journey to Mars | ZzCrook ◪ | 2000-03-18 |
| 112 |
| Julius Caesar | ???? | 2008-10-07 |
| 99 |
| Jump n Bump | Slinky Games | 2004-02-22 | No reviews. | 103 |
