I'm pretty much starting to like NetRadiant Custom, not gonna lie. The skybox preview is a neat feature, and it allows me to quickly see where the sun/moon light is gonna be shining (if the skybox does have a sun/moon visible), so I can plan the geometry accordingly to it if I want to achieve a certain lighting in exteriors from the skybox. It still needs some work on it tho. For example I find the Clipper tool to be difficult to work with, since it only supports just 2 points, not 3 like GtkRadiant, and it doesn't seem to support mapping for Q3 mods at the moment, so I'll write some feature requests on GitHub it seems. And maybe I'll also suggest making the grid a bit more visible on the darkmode background. Otherwise, it's a really good Radiant flavour, which I quite like.