This article is written from a real world point of view.
The Worldbuilder is the official map editor for Generals and its expansion pack Zero Hour. Like its predecessors, maps were created in an in-engine environment, allowing full control over the landscape. It is the only map editor for a Command & Conquer game aside from ED-DOS/EdWin and the original Worldbuilder for Kane's Wrath that comes with the game instead of being distributed as a separate download.
The Worldbuilder sports a more sophisticated interface than FinalSun and FinalAlert 2, in par with the more advanced 3D engine. Its toolbars allow the user to modify a map in many ways, resulting in more complex maps.