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Perhaps the most amazing feat of computer cubing was Silviu Radu and Herbert Kociemba's optimally solving all 164,604,041,664 positions in the half-turn metric back in 2006. Computers were much slower and had much less memory back then, and handling so many different subgroups can be tricky. Radu used GAP to help with the complexity of the group theory, and Michael Reid's optimal solver to provide the fundamental solving algorithms, and Kociemba used his Cube Explorer optimal solver to handle both the smaller subgroups and the positions left over after Radu's subgroup solver ran.