WineBottler allows users to bottle Windows applications as Mac apps.
Wine has always been popular among Linux users for running Windows programs, but Wine is available for Mac, too-and now, free utility WineBottler can "bottle" Windows programs into separate application bundles that run as standalone Mac apps.
In other words, WineBottler is a tool similar to codeweavers Crossover, where separate prefixes are created per app.
Great cross-platform app.