Manage and download Engines, or even custom build engines from Wine. If you need something more powerful, try WineBottler. For more info on how these Wine.app Builds are generated, have a look at the Tech Specs. They are compiled from the sources of and they come as a neat.app with my custom starter.
Sometimes, you need to run Windows on another system.
The conversion is done on-the-fly and enables you to integrate Windows applications into your workflow in no time.