Ghostscript is a processor for PostScript and PDF files. It can rasterize these files to a wide variety of printers, devices for screen preview, and image file formats. Since applications tend to prepare pages for printing in a high-level format such as PostScript, most Unix users with low-level bitmap printers, such as inkjets, use GhostScript as part of the printing process. In addition, Ghostscript is capable of converting PostScript files, functionality comparable to Adobe Acrobat Distiller, but on the command line. In addition, Ghostscript is used for file import and viewing by a great many other applications, including xv, ImageMagick, gimp, and xdvi. Several GUI wrappers for viewing PostScript and PDF files exist, including GSview, ghostview, gv, ggv, and kghostview. This is far from a comprehensive list.
Coin is an implementation of Open Inventor. Open Inventor is the de facto standard API for retained-mode 3D graphics programming. Open Inventor has a highly extensible design, and has been designed to allow for rapid development of highly interactive 3D graphics applications in the fields of CAD, engineering, scientific computing, simulation, VRML, and visualization.
Cult3D is the new multi-platform 3D object rendering engine. It's a technological breakthrough that's 100% software. No additional hardware like 3D accelerator cards are required. As a desktop or notebook user you can now view 3D objects in realtime, a feature formerly found only on expensive workstations. And Cult3D gives all Internet users the opportunity to see high-quality 3D objects on-line on many platforms.
Gifsicle is a powerful command-line program for manipulating GIF image files. It has good support for transparency and colormap manipulation, simple image transformations (cropping, flipping), and creating, deconstructing, and editing GIF animations. It can also optimize GIF animations for space. Also included is a GIF animation viewer and a program that checks whether two GIFs look the same.
Gwave is a waveform viewer. Its purpose is for viewing analog data, such as the output from Spice-like simulations. Gwave can read binary or ascii files written by HSpice from transient, AC, or Sweep analyses, "raw" files written by Spice2, Spice3, or ngspice, and transient analysis files from the CAzM simulator. It can also read a generic tabular ASCII format suitable for use with ACS or homegrown tools. It supports multiple "panels" (graticlules) with multiple variables displayed in each. Two vertical-bar cursors are available for time-difference measurements. Multiple files can be loaded, for comparing the results of several simulations.
GQview is an image viewer for X windows. Features include single click file viewing, external editor support, thumbnail previews, thumbnail caching, and adjustable zoom. GQView has the ability to compare files and list similar or duplicate images based on content. Full screen view and slideshows allow for basic presentation of images. The program offers simple image file management with the ability to copy, move, rename, and delete files. Image collections, similar to a song playlist, are also supported.
Gwenview is a fast and easy to use image viewer/browser for KDE. All common image formats are supported. Standard features include slideshow, full screen view, image thumbnails, drag'n'drop, image zoom, and full network transparency using the KIO framework. It also provides image and directory KParts components for use in applications such as Konqueror. Additional features are provided by the KIPI image framework.