Software
What is a computer, handheld or console without proper software? Not much. Even some computers were more powerful than the direct competitor the one with the most good titles won.
The software I collected have a special meaning for me.
Atari 2600:
PACMAN
Pole Position
Atari Lynx:
California Games
Lemmings
Commodore Amiga:
Deluxe Paint III
OPUS
AmigaOS 3.1.4.
Starglider