CGX aga lets you use CGX 3 on an aga machine, by using cgx if you have a quick processor you can speed up some graphics operations. I used it for a while back in 2003 ish, didn't notice much of a speedup though.
here's a screenshotI used to have all the files required including a pdf document containg instructions on a cd, although I doubt I'd be able to find it, I binned a load of stuff like that when I upgraded to a mediator.