While GSview 5.0 was originally released by under the Aladdin Free Public License (AFPL), it is now considered legacy software and is no longer maintained. Current Status of GSview 5.0
: A lightweight Windows viewer that supports PDF, XPS, and PostScript (if Ghostscript is installed). Obtaining GSview 5.0 - Ghostgum Software Gsview 5.0 Registration Key
A lightweight document viewer designed for multiple document formats including PDF, PostScript, and TIFF. While GSview 5