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[2014 users on Ohloh]
GIMP is an acronym for GNU Image Manipulation Program. It is a freely distributed program for such tasks as photo retouching, image composition and image authoring.

It has many capabilities. It can be used as a simple paint program, an expert quality photo retouching program, an online batch processing system, a mass production image renderer, an image format converter, etc.

GIMP is expandable and extensible. It is designed to be augmented with plu...

[781 users on Ohloh]
Inkscape is a drawing tool with capabilities similar to Illustrator, Freehand, and CorelDraw that uses the W3C standard scalable vector graphics format (SVG). The supported SVG features include basic shapes, paths, text, markers, clones, alpha blending, transforms, gradients, and grouping. In addition, it supports Creative Commons meta-data, node-editing, layers, complex path operations, text-on-path, and SVG XML editing. It also imports several formats like EPS, Postscript, JPEG, PNG, BMP, and ...
[719 users on Ohloh]
ImageMagick┬« is a software suite to create, edit, and compose bitmap images. It can read, convert and write images in a variety of formats (over 100) including DPX, EXR, GIF, JPEG, JPEG-2000, PDF, PhotoCD, PNG, Postscript, SVG, and TIFF. Use ImageMagick to translate, flip, mirror, rotate, scale, shear and transform images, adjust image colors, apply various special effects, or draw text, lines, polygons, ellipses and B├ęzier curves.

The functionality of ImageMagick is typi...

[203 users on Ohloh]
Paint.NET is free image editing and photo manipulation software designed to be used on computers that run Windows. It supports layers, unlimited undo, special effects, and a wide variety of useful and powerful tools.

It started development as an undergraduate college senior design project mentored by Microsoft, and is currently being maintained by some of the alumni that originally worked on it.

Originally intended as a free replacement for the MS...

[195 users on Ohloh]
libpng is the official PNG reference library. It supports almost all PNG features, is extensible, and has been extensively tested for over 12 years.

libpng is available as ANSI C source code and requires zlib 1.0.4 or later (1.2.3 or 1.1.4 recommended due to potential security vulnerabilities in earlier versions). In addition to the main library sources, libpng includes the rpng, rpng2 and wpng demo programs, the pngminus demo program, a subset of Willem van Schaik's PngSuite test images, ...

[137 users on Ohloh]
A widely used free library for JPEG image compression.
[129 users on Ohloh]
GD is an open source code library for the dynamic creation of images by programmers. GD creates PNG, JPEG or GIF, among other formats. GD is commonly used to generate charts, graphics, thumbnails, and most anything else, on the fly. While not restricted to use on the web, the most common applications of GD involve web site development.
[109 users on Ohloh]
F-Spot is a full-featured personal photo management application for the GNOME desktop (http://www.gnome.org/).

F-Spot simplifies digital photography by providing intuitive tools to help you share, touch-up, find and organize your images.

[83 users on Ohloh]
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.
gThumb image viewer and browser
[74 users on Ohloh]
gThumb is an image viewer written for the GNOME environment. It lets you browse your hard disk, showing you thumbnails of image files. It also lets you view single files (including GIF animations), organize images in catalogs, print images, view slideshows, set your desktop background, and more. gThumb also supports Nautilus thumbnails.
GQview image viewer
[60 users on Ohloh]
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 s...
SANE (Scanner Access Now Easy)
[60 users on Ohloh]
SANE is an application programming interface (API) that provides standardized access to any raster image scanner hardware (flatbed scanner, hand-held scanner, video- and still-cameras, frame-grabbers, etc.). The SANE API is public domain and its discussion and development is open to everybody. The current source code is written for UNIX (including GNU/Linux) and is available under the GNU General Public License (the SANE API is available to proprietary applications and backends as well, however)...
[27 users on Ohloh]
Hugin is a toolkit for stitching photographs and assembling panoramas, together with an easy to use graphical front end.
Insight Toolkit
[18 users on Ohloh]
Insight Segmentation and Registration Toolkit (ITK) is an open-source software system to support the Visible Human Project. Currently under active development, ITK employs leading-edge segmentation and registration algorithms in two, three, and more dimensions.
Coppermine Photo Gallery
[17 users on Ohloh]
Coppermine is an **easily** set-up, fast, feature-rich photo gallery script with mySQL database, user management, private galleries, automatic thumbnail creation, ecard feature and a template system for easy customization to match the rest of a site.
[15 users on Ohloh]
GrafX2 is a bitmap paint program that allows you to draw in more than 60 video resolutions including most of the standard Amiga resolutions : 320x200, 320x256, 320x512, 640x256, 640x512, etc. It was written to run under DOS, but the code you'll find here was modified to use SDL and modern operating systems.

This program is dedicated to everybody who knows what a single pixel is. Its layout is not very different from the famous Deluxe Paint or Brilliance, so it will be quite easy to handle...

[14 users on Ohloh]
Cobbler is a Linux installation server that allows for rapid setup of network installation environments.

With a simple series of commands, network installs can be configured for PXE, reinstallations, media-based net-installs, and virtualized installs (supporting Xen, qemu, KVM, and VMware Server). Cobbler uses a helper program called 'koan' (which interacts with Cobbler) for reinstallation and virtualization support.

Cobbler can also optionally help with managing DHCP, DNS, power, co...

[14 users on Ohloh]
Zenphoto is an answer to lots of calls for an online gallery solution that just makes sense. After years of bloated software that does everything and your dishes, zenphoto just shows your photos, simply. It's got all the functionality and "features" you need, and nothing you don't. Where the old guys put in a bunch of modules and junk, we put a lot of thought. Simpler is better
Imager (perl)
[13 users on Ohloh]
Imager is a toolkit for manipulating images from perl.
[13 users on Ohloh]
Verse is a network protocol that lets multiple applications act together as one large application by sharing data over a network. If one application makes a change to shared data, the change is distributed instantly to all the other interested clients.