SC SUM is a Mod based on StarCraft Broodwar 1.16.1 that preserves the classic StarCraft gameplay with all its original units, upgrades and abilities but enhances the tech tree by three new unique super units, corresponding new research facilities and lots of new upgrades and abilities. In detail: 3 new super units, 1 new support unit, 3 new buildings, 15 new abilities and 3 new upgrades.
With version 1.41 it is now possible to play SC SUM in windowed mode.
Thanks to Black_Overseer and racelee07 for requesting this feature. That was a pretty nice idea.