I was trying to think of which games created certain mechanics that became popular and copied by future games in the industry.
The most famous one that comes to my mind is Assassin’s Creed, with the tower climbing for map information.
This is correct. I remember running Quake II in software mode with hardware effects (could that have been OpenGL already?). It ran at like 1 frames per second, because I didn’t have a 3D graphics card. Although the lighting looked lovely when you shot a rocket through a hallway.