Fractint on a 386 VGA PC. Boost if you remember.
@federicomena Ours was originally a 386 SX? 16 MHz, but Norton Utilities measured 9.6
The EGA card was a Prisma EGAMax 860 which had some mad features like multisync monitor support, and even on its own EGA monitor it could do 132 column stuff.
Fractint, Skyglobe, DERIVE were a few utilities I remember, though I was mostly busy with the games.