Ace of Aces Absolute Entertainment/Imagineering?
Crossbow Absolute Entertainment/Imagineering
Double Dragon Absolute Entertainment/Imagineering
F-18 Hornet Absolute Entertainment/Imagineering
Fight Night Absolute Entertainment/Imagineering
Ikari Warriors Absolute Entertainment/Imagineering
Kung-Fu Master Absolute Entertainment/Imagineering
Pete Rose Baseball Absolute Entertainment/Imagineering
Sentinel Absolute Entertainment/Imagineering
Super Skateboardin' Absolute Entertainment/Imagineering
Title Match Pro Wrestling Absolute Entertainment/Imagineering
Tomcat Absolute Entertainment/Imagineering
Touchdown Football Absolute Entertainment/Imagineering
Basketbrawl BlueSky Software
Klax (unreleased) BlueSky Software
Mat Mania Challenge BlueSky Software
Mean 18 Ultimate Golf BlueSky Software
MotorPsycho BlueSky Software
Ninja Golf BlueSky Software
Scrapyard Dog BlueSky Software
Xenophobe BlueSky Software
California Games (unreleased) Computer Magic (under subcontract with Man Development Corp.?)
Impossible Mission Computer Magic (under subcontract with Man Development Corp.?)
One-on-One Basketball Computer Magic (under subcontract with Man Development Corp.?)
Summer Games Computer Magic (under subcontract with Man Development Corp.?)
Winter Games Computer Magic (under subcontract with Man Development Corp.?)
Barnyard Blaster Datafast Computer Services?
Planet Smashers Datafast Computer Services
The Time Lords of Xantac (UR) Datafast Computer Services?
Desert Falcon GCC
Diagnostic Cartridge GCC
Dig Dug GCC
Food Fight GCC
High Score Cartridge (UR) GCC
Ms. Pac-Man GCC
Pole Position II GCC
Rescue on Fractalus! (UR) GCC
Robotron: 2084 GCC
Toki (unreleased) Images, Maximum Effect
Pit-Fighter (unreleased) Imagitec Design
Rampart (unreleased) Imagitec Design
GATO (prototype) ibidinc
Hat Trick ibidinc
Electrocop (unreleased) ICC
Donkey Kong ITDC
Donkey Kong Junior ITDC
Mario Bros. ITDC
Super Stunt Cycle (unreleased) John Boeschen & Co.
MeltDown Radioactive Software, Sculptured Software?
Midnight Mutants Radioactive Software, Sculptured Software
Alien Brigade Sculptured Software
Commando Sculptured Software
Dark Chambers Sculptured Software
Fatal Run Sculptured Software
Missing in Action (unreleased) Sculptured Software
Rampage Spectral Dimensions
Paperboy (unreleased) Tiertex
Road Riot 4WD (unreleased) Tiertex
Steel Talons (unreleased) Tiertex
Plutos (unreleased) Tynesoft
Sirius (unreleased) Tynesoft
Deflektor (unreleased) US Gold
Gauntlet (unreleased) US Gold?
Jinks US Gold
Tower Toppler US Gold?
RealSports Baseball ?
Skyfox (unreleased) ?
Super Huey UH-IX ?
Tank Command ?
Water Ski ?
Credit where due: List formatting was probably inspired by this post
Zero magazine claimed Tony Porter and Bob Armour were working on 7800 Gauntlet at US Gold. However, Armour has said he only worked on the Atari 8-bit version and was not aware that a 7800 version existed.