Wing is a modeling tool used for creating realistic natural landscape efficiently. More specifically, we try to proceduraly generate four key ingredients of nature ---- plants, terrain, water and weather, with simple but powerful user controls.
PS_View is a PostScript and PDF previewer. It is multiplatform (Windows, Linux and Mac OS X), GUI program based on the Ghostscript engine. Key features include huge magnification, fast viewing of large documents, exact measuring, and restart.