LEBuild is a Duke Nukem 3D level editor written from scratch in Visual Basic 6, meaning that it runs under Microsoft Windows. I've been developing it from mid 2004 till late 2008. No code from the original Build editor was used, some stuff (like texture mapping) was done through reverse engineering. The fundamentals of my editor are batch editing and the total control over the map. Otherwise this is to be an alternative to BUILD editor for DOS with a multilingual GUI and extended sector/wall/sprite limits.

Project's page: http://lzg.duke4.net/leb10.htm