
GSview is a graphical interface for Ghostscript. Ghostscript is an interpreter for the PostScript page description language used by laser printers. For documents following the Adobe PostScript Document Structuring Conventions, GSview allows selected pages to be viewed or printed. GSview requires Ghostscript.
GSView is a user-friendly viewer for various document formats including Postscript, PDF, XPS, EPUB (version 2, no DRM), CBZ, JPEG, and PNG files. GSView leverages the viewing capabilities of MuPDF, along with the conversion capabilities of Ghostscript to provide both a fast and high quality on-screen experience, and high quality export and conversion features.
There are two "branches" of GSView. They share a name and have very similar function and UI, but they have only some common code and have different copyrights.