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"jpgtn" is based on "tnpic" by Russell Marks and on "gtnpic" by Willie Daniel. "tnpic" was originally distributed as a utility with Marks' "zgv" program. "gtnpic" was an attempt to clean up and expand upon the original tnpic program and "maybe add some new features along the way." Jpgtn differs from both "tnpic" and "gtnpic" in purpose. It is *not* an indexer of image files. It simply creates thumbnails of images stored in JPEG format.

AMIDE is a competely free tool for viewing, analyzing, and registering volumetric medical imaging data sets. It's been written on top of GTK+, and runs on any system that supports this toolkit.

Art of Illusion is a free, open source 3D modelling and rendering studio. Many of its capabilities rival those found in commercial programs. Highlights include subdivision surface based modelling tools, skeleton based animation, and a graphical language for designing procedural textures and materials..

appleseed is modern, open source, physically-based rendering engine designed to produce photorealistic images, animations, and visual effects. It provides individuals and small studios with an efficient, reliable suite of tools built on robust foundations and open technologies. Started in 2009, it has grown into a robust production rendering toolset and has been battle-tested on several projects such as TV documentaries, ads, promotional videos, and animation shorts.

The goal of the lensfun library is to provide an open source database of photographic lenses and their characteristics. In the past there was an effort in this direction (see http://www.epaperpress.com/ptlens/), but then author decided to take the commercial route and the database froze at the last public stage. This database was used as the basement on which lensfun database grew, thanks to PTLens author which gave his permission for this, while the code was totally rewritten from scratch (and the database was converted to a totally new, XML-based format). The lensfun library not only provides a way to read the lens database and search for specific things in it, but also offers a set of algorithms for correcting images based on detailed knowledge of lens properties and calibration data. Right now lensfun is designed to correct distortion, transversal (also known as lateral) chromatic aberrations, vignetting, and colour contribution of the lens (e.g. when sometimes people says one lens gives "yellowish" images and another, say, "bluish").

libEMF is a C/C++ library which provides a drawing toolkit based on ECMA-234. The general purpose of this library is to create vector graphics files on POSIX systems which can be imported into StarOffice/OpenOffice.

GLText is a portable font rendering library for C++ OpenGL applications. It uses FreeType2 to read and render high-quality TrueType fonts with a minimal footprint. With just a few easy lines of C++, you can add gorgeously rendered text to your graphical applications. GLText is an open source project licensed under the LGPL. Basically this means that you can use and link your application with it regardless of what license your application uses. If you make changes to GLText, however, you must make those changes open source under the LGPL. Written with portablility in mind, GLText works on Windows, Linux, FreeBSD and IRIX - virtually anywhere that FreeType2 supports.

libgnomecanvasmm provides C++ wrappers for libgnomecanvas, for use with gtkmm.

A GUI for Panorama Tools, to stitch panoramic images. With hugin you can assemble a mosaic of photographs into a complete immersive panorama, stitch any series of overlapping pictures and much more.

libiptcdata is a library, written in C, for manipulating the International Press Telecommunications Council (IPTC) metadata stored within multimedia files such as images. This metadata can include captions and keywords, often used by popular photo management applications. The library provides routines for parsing, viewing, modifying, and saving this metadata. The libiptcdata package also includes a command-line utility, iptc, for editing IPTC data in JPEG files.