[hmstx]

For tech3 based stuff, maybe try Netradiant (forked from GtkRadiant), or more specifically its fork (!) NetRadiant Custom (https://github.com/Garux/netradiant-custom). That one introduces some, er, Trenchbroomisms to its workflow, mostly to do with editing straight from the 3d viewport and the texturing tools.

As far as I can tell from using it with tech4, it also appears to have developed quirks with some basic functionality that I don't remember from other GtkRadiant derivatives (although in tech3). This might be from the incomplete tech4 support inherited from both its parents, or just from NetRadiant, or just new altogether, I have no idea or urge to find out... but still, friendly warning : maybe keep GtkRadiant around and go back and forth just in case.

[emmelaich]

I tried Netradiant but

1. the ui is basically the same as Radiant which is poor.

2. Documentation not as as good as Radiant

3. (Gtk)Radiant is still getting updates, and it's not clear whether NetRadiant is getting those fixes and unclear whether it could very easily, considering the different language.