I prefer my knife in the center of my chest where either hand can reach it easily, attached to my chest strap.
Compass on a retractor.
Octo is integrated into my power inflator. (one less hose)
Computer is wireless (one more less hose)
Dive light mounted to my camera tray to use one handed if needed (love this)
Whistle on my shoulder strap
Safety sausage out of the way on a d-ring under my air cell by my rear end :-)