Command-line graphics software

ImageMagick, invoked from the command line as magick, is a free and open-source cross-platform software suite for displaying, creating, converting, modifying, and editing raster images. It can read and write over 200 image file formats and is widely used in open-source applications. ImageMagick was created by John Cristy in 1987.

Zopfli is a data compression library that performs deflate, gzip and zlib data encoding. It achieves higher compression ratios than mainstream Deflate and zlib implementations at the cost of being slower. Google first released Zopfli in February 2013 under the terms of Apache License 2.0. Google archived the project in October 2025.

GraphicsMagick is a fork of ImageMagick, emphasizing stability of both programming API and command-line options. It was branched off ImageMagick's version 5.5.2 in 2002 after irreconcilable differences emerged in the developers' group.

In the X Window System, the program xwd (X Window dump) captures the content of a screen or of a window and optionally saves it into a file.