GoInFront 2.0 for Mac can be downloaded from our website for free. The program lies within Theming Tools, more precisely Multiple Desktops.
From the developer:
GoInFront brings back OS 9 window handling when you switch between applications. Clicking on any application window will bring ALL the windows and the application forward, not only the clicked window. This is the way it was under OS 9 and I still think it's correct.
You may want to check out more software for Mac, such as Occurrence Selector, which might be related to GoInFront.