Alternatives do GtkRadiant?

[vinny]

Is there any alternative level editor for Q3? I really can't get used to the Radiant editors. Hammer, maybe?

[Theftbot]

Notepad++

[Hipshot]

Quake Army Knife

[CZghost]

Notepad, that's the way Lunaran made the You'll Shoot Your Eye Out level... QuArK was too tricky for me, so I stayed at Radiant. Maybe it's forks, like NetRadiant or DarkRadiant, or old one Q3Radiant

[Eraser]

lol no, Lunaran didn't use Notepad for that. At least, not in the way you probably mean.
He wrote Python scripts to generate the level's geometry.

[CZghost]

How sweety is the generated map

[Bacon]

3d studio max, maya, blender etc, most have converters that will output to a .map or a .ase.