I guess that's not the right thread for that. But, however:

I'm using OpenGL with the dglOpenGL.pas-header, SDL for every interaction with the OS, Newton for the physics stuff and Geometry.pas for calculations in the Euclidean Space.

EDIT: Graphics.pas, lol. My very first game was written with Graphics.pas. Really nice, but 60% CPU usage. xD

No. MechaChess is completely independent from all Delphi Standard Units except System.pas.