I added a (rough) Doom 3 .def file generator to mkeditorpacks (see unvanquished-mapeditor-support. I also patched (locally) DarkRadiant to finish the Quake 3 .map read support (it was still using dummy texture sizes in Q3 legacy brush parser) to get textures properly scaled, and I got this:
On the screenshot the telenode model is not displayed because there is no IQM model format support in DarkRadiant but that is not blocking.
For the moment the recommended and supported editor is NetRadiant from Xonotic upstream (NetRadiant-custom will not work, it lacks more than 6 years of developement including the features we need) and the fallback that mostly works is GtkRadiant (I updated Mapping Tools page on wiki. Maybe one day DarkRadiant will work as well?)
In the past DarkRadiant was successfully built on macOS, and the project recently switched to CMake so it may be easier to fix build issues if there was regressions.
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Beware that DarkRadiant does not have exporter for that Q3 legacy brush format. So, with luck you may get the Q3 non-legacy brush format on writing, which is still compatible with NetRadiant and q3map2, but you would have converted the map (so don't do it on Unvanquished source repositories).
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Quake 3 brush format is not written yet, instead an alternative Q3 brush format is written which is used by some games like Xonotic but usually not used by default by Q3 derivatives (and Unvanquished does not);
the IQM patch for the picomodel library was submitted to DarkRadiant (this is the same code currently used in GtkRadiant and NetRadiant). This plugin does not support animation anyway;
the dpk/dpkdir format works in a basic way (like a pk3/pk3dir: everything is loaded);
DEPS is not supported in dpk/dpkdir files (like a pk3/pk3dir).
DarkRadiant has interesting features:
Model Browser;
Entity picker with model preview;
Model animation viewer (but only supports MD5 model even with IQM picomodel plugin);
Material editor (our format is different but very close, maybe we can patch that);
Particle editor (our format is different);
Some git repository features (haven't tried);
Map reload and Camera sync with a compatible Doom3 engine, I would be very interesting to see this ported to Dæmon engine and other editors like NetRadiant, I expressed that need for NetRadiant in 2016, DarkRadiant got it in 2020 with 2.9.0 (Note: their engine does not require heavy map compilation like us)
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Quake 3 brush format is written, it is now implemented;
the IQM patch for the picomodel library was submitted to DarkRadiant (same code as in GtkRadiant and NetRadiant). Animations aren't supported;
the dpk/dpkdir format works in a basic way (like a pk3/pk3dir: everything is loaded);
DEPS is not supported in dpk/dpkdir (loaded like a pk3/pk3dir like GtkRadiant), this if NOT a problem is your mapping environment is clean;
some models are not properly scaled, it only affects DarkRadiant display (they are correctly displayed in game).
Note that .map files written by DarkRadiant, NetRadiant or GtkRadiant may differ because of minor difference in writing floats, so switching between tools may produce a lot of diff noise in git repositories.
This comment is licensed under cc by 4 and antecedent. The Crunch tool is awesome!
The 
Quake 3 brush format is not written yet, instead an 
The 
DEPS is not supported in dpk/dpkdir (loaded like a pk3/pk3dir like GtkRadiant), 
this if NOT a problem is your mapping environment is clean;
some models are not properly scaled, 
