| Name | Project | Active date |
|---|---|---|
| Jan Supol | ee4j.jersey | January 3, 2018 |
| Jan Supol | ee4j.jsonb | March 12, 2018 |
| Jan Supol | ee4j.jsonp | January 3, 2018 |
| Jan Supol | ee4j.parsson | June 3, 2021 |
| Jan Supol | ee4j.rest | January 3, 2018 |
| Jan Supol | ee4j.tyrus | January 3, 2018 |
| Jan Supol | ee4j.websocket | January 3, 2018 |
| James Sutherland | ee4j.eclipselink | June 26, 2007 |
| Joe Szurszewski | eclipse | January 28, 2004 |
| Jim Talbut | rt.vertx | November 4, 2021 |
| Jonathan Tan | technology.jgit | October 22, 2018 |
| Jie Tao | technology.g-eclipse | September 18, 2007 |
| Jane Tatchell | technology.birt | January 28, 2004 |
| Jeremie Tatibouet | modeling.papyrus | February 4, 2016 |
| Jeremie Tatibouet | modeling.syson | November 9, 2023 |
| Joerg Tessmer | automotive.kuksa | December 7, 2017 |
| Jao Tham | technology.epf | January 9, 2006 |
| James Thario | technology.epf | January 9, 2006 |
| Jayant Thomas | technology.vtp | August 2, 2005 |
| John Trevisan (ClearBlade) | tools.edt | October 26, 2010 |
| Jupp Tscheak | automotive.openpass | December 12, 2022 |
| Jaroslav Tulach | ee4j.jersey | February 20, 2018 |