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GIMPshop is a modification of the free/open source GNU Image Manipulation Program (GIMP), intended to replicate the feel of Adobe Photoshop. Its primary purpose is to make users of Photoshop feel comfortable using GIMP.

Pinta is a drawing/editing program modeled after Paint.NET. Its goal is to provide a simplified alternative to GIMP for casual users.

Shotwell is a digital photo organizer that runs on Linux. It is the default photo manager in Ubuntu 10.10 and Fedora 14.

Nathive is a libre software image editor, similar to Adobe Photoshop, Corel Photo-Paint or GIMP, but focused on usability, logic and providing a smooth learning curve for everyone.

Rawstudio is an open-source program to read and manipulate RAW images from most digital cameras and convert RAW files into JPEG, PNG or TIFF images.

Darktable is a virtual light table and darkroom for photographers: it manages your digital negatives in a database and lets you view them through a zoomable light table. it also enables you to develop raw images and enhance them.

digiKam is an advanced digital photo management and editing application that uses KDE SC 4 desktop environment technologies.

MTPaint is a light-weight graphics editor and paint program for Windows and Linux that comes with an interesting feature set.

The PosteRazor cuts a raster image into pieces which can afterwards be printed out and assembled to a poster.

Seashore is an open source image editor for Mac OS X’s Cocoa framework. It features gradients, textures and anti-aliasing for both text and brush strokes.

Xara Xtreme for Linux is a powerful, general purpose graphics program for Unix platforms including Linux, FreeBSD and (in development) OS-X.

Hugin is an easy to use cross-platform panoramic imaging tool. You can assemble a mosaic of photographs into an immersive panorama image, stitch any series of overlapping pictures and much more.

Paint.NET is free image and photo editing software for Windows operating systems. It’s many features include features an intuitive user interface with support for layers, unlimited undo, special effects, and a wide variety of useful and powerful tools.

GIMP is the definitive GNU image manipulation software, ideal for tasks such as photo retouching, image composition and image authoring. It works across most operating systems and is delivered in a variety of different languages.