RatBZEdit is a free-software map editor for BZFlag. It supports box, pyramid, base, and waterLevel. Written entirely in Python, there is no need to compile any source code to use it. There is currently no object editing or 3D rendering, so WE NEED HE
Orange 3D, a game engine distributed under the zlib/libpng license, is an all in one solution, with IDE, level editor, 2d painter, 3d modeler, and possibly audio editingsoftware all in one clean package, for free!