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gifsicle is a powerful command-line program for manipulating GIF image files. Extensive options let you control what exactly it does.

glosm is a framework for developing high-performance geospatial data visualization applications of both interactive and batch nature featuring OpenGL-based 3D first-person and tile renderers.

GNOME Color Manager is a session framework for the GNOME desktop environment that makes it easy to manage easy to manage, install and generate color profiles.

This is the Gimp user manual. It contains a large number of examples and descriptions of the various Gimp tools and techniques.

HDR Tools is a set of command-line tools for creating and manipulating High Dynamic Range (HDR) images. It consists of six programs: hdr_create, hdr_fix_ca, hdr_denoise, hdr_squish, hdr_adjust, and hdr_convert. Together, they can convert a set of bracketed photographs to HDR image (in EXR format), fix chromatic aberrations and CCD noise, perform tone mapping and some simple color manipulations, apply gamma correction and optionally adjust the exposure, crop, and finally convert the result into a "normal" image (a JPG, for example).

Cairo is a library to render high quality vector graphics. There exist various backends that allows rendering to Gtk windows, PDF, PS, PNG and SVG documents, amongst others.

Displays an image in a 256-color enabled terminal with UTF-8 locale, such as gnome-terminal, konsole, uxterm or rxvt-unicode (urxvt).

Ida is a small and fast image viewer, motif-based. For people who don't want the KDE/GNOME overhead. Some basic editing functions are available too.

Kudu is a GTK+ and OpenGL powered animation package, which relies mostly on skeletal animation and has an interface loosely based on the style of Wings3D.

The Jave project is a Java based ASCII-Art-graphic editor. It allows drawing new images as well as converting JPG-Images to ASCII-Art.