Yap (computer program)
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Yapshot.png
In computing, Yap, an acronym for Yet Another Previewer, is a PostScript previewer. It is used to dynamically edit and re-render PostScript as if one was editing a file, unlike the actual PostScript interpreter itself (such as ghostscript), which deals with PostScript input interactively from a user.
Yap first was bundled with the NeXT demos package of NeXTSTEP, which was also bundled with OPENSTEP. It was not carried into its incarnation as Mac OS X, presumably because of PostScript's lessened importance with the OS X subsystems relying on Display PDF instead.
It is also the name of the DVI viewer included on the widely used MiKTeX (http://www.miktex.org/) TeX distribution for the Microsoft Windows platform. Yap allows zooming in and out by several integer factors, besides having a "magnifying glass" feature for local zooming. It supports PostScript specials (for instance, rendering LaTeX documents with PSTricks). Since Yap supports inverse-search (when the dvi file was compiled with source specials), it can be configured to launch a LaTeX editor for the source file placing cursor on the corresponding word under the cursor in Yap.
Yap is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version.