I found Tool Box Lux RAD here: https://gamebanana.com/tools/5591
Gen Surf here: https://gamebanana.com/tools/5589
The website for Radiant is here: http://radiant.robotrenegade.com/
The website for QuArK is here: http://quark.sourceforge.net/infobase/index.html
FGD files i'll need more specific info on, afaik the latest fgds are still around and support Hammer 3.5 era features.
I'll get mirrors for these tools up later on.
It may be useful to make a new version of Tool Box Lux RAD that's integrated with a set of tools that can work on GoldSource as a whole, like the Source SDK lists all the tools.
Since rad file editing is so straightforward it may be easier to have one main tool that has the utility stuff built into it. I've thought of doing that before, so it may be useful.