J
- Jackson — Hyper-Threading
- Jackson Pollock — Apple QuickDraw 32-bit
- Jaguar — Apple Mac OS X v10.2
- Jaguar — Sun VME/SMD-4 disk controller
- Jalapeño — Sun ASIC for Nachos/SunVideo
- Janus — Microsoft Windows 3.1
- Jasmine — Sun 17" premium monitor
- Jason — Apple ][c
- Jasper — Sun StorEdge PCI Dual Ultra3 SCSI Adapter
- Jaunty Jackalope — Ubuntu 9.04
- Javelin — Sun 2 CPU PCI midrange workgroup server
- Jayhawk — Intel Xeon processor based on Tejas; project cancelled
- Jeckle — Sun 3.5" 535 MB disk
- Jedi — College Linux 2.1
- Jedi — Cyrix processor
- JeDI — Apple Macintosh PowerBook 150 ("Just Did It")
- Jedy — SiS 5581/5582
- Jelly Bean -Android OS Successor of Ice Cream Sandwich
- Jeeves — Sun Java-powered Internet Server software (Java Web Server)
- Jet — Sun VX, MVX
- Jiro — Sun Project StoreX
- John — Conner CFP1080E
- John — IBM DPES-31080
- Jonah — Intel 3rd generation Pentium M core (also known as Yonah)
- Joshua — Cyrix processors
- Juhhu! — UHU Linux 1.0
- Jumanji — Sun StorEdge A7000
- Juneau — Intel JN440BX
- Junior — Alt Linux 1.1
- Junior — Alt Linux 2.0
- Jupiter — Microsoft Windows CE 2.11 for Handheld PC version 3
- Jupiter — Microsoft XML-based web services products
- Jupiter — SunOS 5.0 (Solaris 2.0)
Read more about this topic: List Of Computer Technology Code Names