It shares all GIMP’s advantages, including the long feature list and customisability, while addressing some common criticisms regarding the program’s interface: GIMPshop modifies the menu structure to closely match Photoshop’s, adjusts the program’s terminology to match Adobe’s, and, in the Windows version, uses a plugin called ‘Deweirdifier’ to combine the application’s numerous windows in a similar manner to the MDI system used by most Windows graphics packages. While GIMPshop does not support Photoshop plugins, all GIMP’s own plugins, filters, brushes, etc. remain available.

Its key features include the following:

- Drawing Tools: Pinta includes all the common tools you expect like Brushes, Pencil, Shapes, Eraser, and Selections.

- Multiple Layers: Pinta supports unlimited layers.

- Full History: Pinta provides unlimited levels of Undo/Redo.

- Adjustments and Effects: Pinta includes a a wide array of adjustments and effects for tweaking your images.

Shotwell includes the following features:

- Import photos and videos directly from a digital camera.
- Automatically group photos and videos by date.
- Support tagging.
- Editing features allow users to rotate, crop, eliminate red eye, and adjust levels and color balance.
- Includes auto “enhance” option that will attempt to guess appropriate levels for the image.
- Allows users to publish their images and videos to Facebook, Flickr, Picasa Web Albums, and YouTube.

The project runs in the GNOME desktop environment and anyone is welcome to collaborate on it with code, translations or ideas.

It has a graphical user interface, so you can simply open a RAW file and experiment with the controls to see how they affect the image. Rawstudio has a very simple architecture which is optimized for ease of use and therefore should be intuitive to most photographers.

The normal workflow would be that you first convert your RAW files and then use an image editing application to further work on your images. Rawstudio itself is a highly specialized application for processing RAW images, not a fully featured image editing application.

Key features include:

- Intuitive GTK+ interface
- Reads all dcraw supported formats
- Internal 16bit rgb
- Color management using Little CMS
- Batch processing
- Various post-shot controls (white balance, saturation and exposure compensation among others)
- Realtime histogram
- Optimized for MMX, 3dnow! and SSE (detected runtime)
- Exposure mask, cropping, straighten
- Easy sorting of images
- XML settings cache
- Basic EXIF-reading
And much more…

Key features include:

- flexible data base queries, search by tags, simple tagging by related tags.
- image rating (stars) and color labels, filtering and sorting within the base query.
- import a variety of standard, raw, and high dynamic range image formats (e.g. jpg, cr2, hdr, pfm, .. ).
- zero-latency user interface through multi-level software caches.
- fullscreen, zoomable user interface.
- color-managed image operations in L*a*b* and profiled rgb: rotate/crop, color correction, input/output/display color profile management, edge-avoiding wavelet domain editing (e.g. edge-aware denoise, ringing-free sharpen), exposure controls, flexible color zone mapper (e.g. make all colors except red monochrome, imitate polarizing filter, etc.), lens defect correction (lensfun), color filter based monochrome conversion, unsharp mask sharpen, white balancing, tone curve, and base curve, and more.
- and much more…

It supports all major image file formats, and can organize collections of photographs in directory-based albums, or dynamic albums by date, timeline, or by tags.

Users can also add captions and ratings to their images, search through them and save searches for later use.

Using plugins they can also export albums to 23hq, Facebook, Flickr, Gallery2, Google Earth’s KML files, SmugMug, Piwigo, Simpleviewer, burn them on CD, or create web galleries.

Key features include:

- Import pictures
- Organize your collection
- View items
- Edit and enhance photos
- Correct lens distortion
- Create (slideshows, calendar, print, …)
- Share your creations (using social web services, email, your own web gallery etc.)

Some of its main features include the following:

- A comprehensive and user friendly interface with customizable toolbars, screen sizes, screen layouts, zoom sizes, up to 1000 undos and more.

- Pixel art capabilities that allow you to edit indexed palette or RGB images; save and load BMP, GIF, JPEG, LSS, PNG, TGA, TIFF, XPM, XBM files; use image channels: Alpha, Selection, Mask, all saved to a PNG file; create up to 100 layers; create animations and more.

- Image manipulation such as the ability to quickly transform image gamma, brightness, contrast, saturation, hue, posterize from a single dialog, and preview the results in real time; apply various effects such as invert, greyscale, isometric transformations, edge detect, sharpen, unsharp mask, soften, Gaussian blur, emboss, bacteria; crop at the touch of a button and resize the canvas at will.

It supports multiple layers and alpha channel editing. It is based around the GIMP’s technology and uses the same native file format.

Seashore’s features include:

* Full support for the GIMP’s native XCF file format

* Read and write support for the TIFF, PNG, JPEG, JP2000 and GIF file formats

* Read-only support for the BMP, PICT, PDF and XBM file formats

* Layers with over 20 merging effects

* Ability to edit just the primary or alpha channels

* Thorough transparency effects including semi-transparent gradients

* Arbitrary selection regions

* Anti-aliased brush strokes

* 6 basic gradient effects with 16 variations

* Tablet support

* ColorSync support (including embedded profiles in TIFFs and CMYK previewing)

* Plug-in filters