From Quad Software:
Grome is a professional level editor used by game studios for XBox360, Playstation3.
and PC titlesDue to its multitude of editing tools, Grome is not only a terrain editor but rather a complete scene constructor.
Grome was especially designed for game developers but its usage is not limited to entertainment industry. The editor was successfully used for virtual reality projects, real-time 3D simulation software and creation of scenes for offline rendering.