John Siracusa

SwitchGlass adds a dedicated application switcher to your Mac. You can customize its appearance, size, and position on each attached display. Use it to bring one or all of an app’s windows to the front, or as a drag-and-drop target to open files.

Front and Center lets you control the window layering policy on your Mac. In "Classic" mode, clicking on a window brings all the windows in that app to the front, just like it did in classic Mac OS. In "Modern" mode, only the clicked window comes to the front.