Fotografix

In addition to being totally portable, Fotografix has a ridiculously small footprint. Its a 370Kb download and about 700Kb once extracted. Despite its size, most of the features I rely on in Photoshop are available.

Free Windows

Serif PhotoPlus

PhotoPlus is the free, feature-restricted image editing software by Serif that enables you to fix and enhance your digital photos; paint and blend with brushes; and export you photos for print, email, and the web.

Freemium Windows

PixBuilder

Free Photo Editing Software for PC PixBuilder Studio is a free image editing software program for digital photo editing, images processing, and resizing. For digital photo editing, you can use its many professional quality functions.

Free Windows

CinePaint

CinePaint is a deep paint application that edits EXR, DPX, 16-bit TIFF, JPEG, PNG and many other types of image files. CinePaint is available as a native application for Linux, Mac OS X, and BSD.

Free Open Source Mac OS X Linux

Autodesk Mudbox

Autodesk Mudbox digital sculpting and texture painting software offers 3D modeling professionals the ability to quickly and easily create highly detailed organic and inorganic 3D assets.

Commercial Mac OS X Windows

Inpaint

Do you have a photo that would look just right if you could only remove one or more objects or persons from your composition? Well, now you can remove just about any unwanted object or person using Inpaint.

Freemium Mac OS X Windows Web

PaintStar

PaintStar is a versatile digital image processing software suitable for such tasks as retouching of photographs, composing and authoring images, image morphing, screen capture, and displaying image thumbnail in Windows Explorer context...

Free Windows

showFoto

ShowFoto is the standalone image editor of the digiKam project. It runs without digiKam images database support, but provides all Image Editor functions.

Free Open Source Mac OS X Windows Linux KDE

PixelStyle

PixelStyle Photo Editor for Mac is an all-in-one photo editing and graphic design software, providing professional high-quality photo processing tools to edit the photos, enhance and touch up photos on Mac OS X.

Freemium Mac OS X

MangaLabo

MangaLabo is an easy-convenient comic illustration tool. You can handle the overall steps, Draft -> Panel Layout -> Ink Sketching -> Tone Placing -> Comic Organizing, with MangaLabo.

Commercial Windows

Pixelitor

Pixelitor is a cross-platform raster graphics editor written in Java. It supports image filters, drawing, layers, multiple undo, etc.

Free Open Source Mac OS X Windows Linux

Image Analyzer

Advanced image editing, enhancement and analysis software. The program contains both most image enhancement features found in conventional image editors plus a number of advanced features not even available in professional photo suites.

Free Windows

Hexagon

Hexagon delivers all the tools a graphic artist needs to create complete, detailed, textured 3D models ready to be rendered.

Commercial Mac OS X Windows

Gnome Paint

gnome-paint is a simple, easy to use paint program for GNOME. It is inspired by MS-Paint.

Free Open Source Linux

AndreaMosaic

With AndreaMosaic you can create your own photographic mosaics made with your own pictures. A photo mosaic is an image composed of many tiled photos.

Free Mac OS X Windows Linux

Rocket 3F

Rocket 3F is polygonal modeller created for Concept Artists and Designers. Modeling with Rocket 3F is like drawing - very Simple and Inspiring! The Most important feature of Rocket 3F is Workflow! It is Fast Fun and Friendly!

Free Personal Windows

Fotowall

Fotowall is an opensource creative tool that lets you play with your pixels as youve ever wanted! Make the perfect arrangement with your photos, add text, live video from your webcam and the best internet pictures.

Free Open Source Mac OS X Windows Linux

Paint +++

Paint +++aims to fill the need for a basic, streamlined, and Mac-native image editor. Whether you need to quickly crop a photo, add some text to an image, or just have fun doodling, scrawl has you covered.

Commercial

Deleter CGillust

Deleter CGillust (CG Illustration) is an early clone of OpenCanvas with a trial version that is not time limited. It has OpenCanvas' brushes, wacom support, and layer modes functionalities.

Commercial Windows