This should be fun...
These are my top pics. Not all are listed.
This is for original games created by each company, not licensed ones, such as Bally-Midway Pac Man, for example.
Atari – Asteroids
Taito – Space Invaders
Nintendo – Donkey Kong
Williams – Defender/Stargate
Exidy – Star Fire
Cinematronics – Star Castle
Namco Pac Man (this one was hard, I prefer Galaxian/Galaga)
Konami – Gyruss
Nitchibtusu – Moon Cresta
Gremlin - Carnival
Bally-Midway – ??? (What did they publish that was their own work other than pinball machines?)
Kee Games - Tank (Yeah, it's Atari, but what wasn't from Kee?)