- GtkRadiant uses ~/.radiant/1.6.0/
- UFORadiant uses `~/.ufoai/radiant/
- DarkRadiant uses ~/.darkradiant/
- NetRadiant was using uses both ~/.netradiant/1.5.0/ and ~/.netradiant/1.1.5/, which is not defined by the version but the way you build it.
- AARadiant uses `~/.aaradiant/1.5.0/
- XrealRadiant used ~/.rxealradiant/
I guess no one Radiant out there needs a version number in config path to not mess with other Radiants.