Alien Space Saver(formally A.S.S). Kool thing about this product is it's 100% modular.
I like the "modular" part. I've been using cheap "sawtooth" wrench organizers since the '80s; sometimes full-length, sometimes cut-to-fit a certain number of wrenches.
Made by
Protoco (NOT "Proto" tools) along with their socket organizers which I have mixed-feelings about. Both the wrench organizers and the socket organizers have been sold by "truck tool" companies.
The wrench organizers have the benefit of being very simple and inexpensive.
You must be registered for see images attach
The black-plastic socket rails as sold by Mac Tools in the '80s/'90s used stackable round pegs. Worked great. The rails had lots of holes for pegs, so the socket spacing could be customized depending on the diameter of the sockets. They were later "improved" with red plastic rails and crappy plastic "spring clips" that I genuinely hate. The spring clips hold the sockets
so well that the clips pull out of the rails instead of the sockets pulling out of the clips.
You must be registered for see images attach