Open Source Photo Editing Software
Ghost
Ghost is a free and open-source headless CMS and blogging platform developed by Ghost Foundation. With Ghost you can manage content in style, the user experience provided by the software is intuitive and encourages writing. Ghost is written in JavaScript for the Node.js platform and is released under the MIT license.
OpenToonz
OpenToonz is a free and open-source, 2D animation product software published by DWANGO. OpenToonz is based on the source code of Toons by Studio Ghibli and features sequence number scanning can be conducted efficiently according to in between animation numbers. Four types of scanning (black & white, colored, with or without binarization). Scan settings that can be saved and reproduced. All while being compatible with the TWAIN standards.
nomacs
nomacs is a free, open source, cross-platform image viewer. With nomacs you can easily view and manage all common file formats including jpg, png, tif, bmp, raw and many more. The sleek user interface provided by nomacs features a semi-transparent widgets that display additional information such as thumbnails, metadata or histogram.
Blender
Blender is a free and open-source 3D model software released under the GNU General Public License. The software can be used for 3D modeling, 3D animation, UV unwrapping, texturing, rigging, skinning, rendering, particle generation, water simulation and much more.
Glimpse
Glimpse is an open source image editor based on the GNU Image Manipulation Program (GIMP) 2.10.18. The goal of Glimpse is to experiment with new ideas and expand the use of free/libre software. Glimpse brings a new name and logo, a cleaner UI, and fewer "easter eggs" make an already amazing open source software package feel more enterprise-ready.
PhotoQt
PhotoQt is a free and open-source, simple yet powerful image viewer, based on Qt/QML. It mprovides provides a simple and uncluttered interface filled powerful features. PhotoQt supports GraphicsMagick, Libraw, FreeImage, DevIL, Poppler, libarchive.
gThumb
gThumb is a free and open-source image viewer and Image organizer for the GNOME Desktop. The software can be used to view, orginize and edit BMP, GIF, ICO, JPEG, PNG, TIFF, XPM files. An importer tool is also include, it can be used for transferring photos from cameras. With the editing tool, photos can be rotated, flipped and cropped, or optimized for the right contrast ratio. gThumb is developed by the The GNOME Project and released under the GNU General Public License.
MyPaint
MyPaint is a free and open-source raster grahics editor use for digital painting. The software is easy to use and works well with graphics tablets such as Wacom and the likes. MyPaint comes with a builtin brush engines that is highly configurable and allows the user to experiment by creating own brushes that can be used to create unique digital paintings.
Eye of Gnome
The classic Eye of GNOME is the official and default image viewer for the free and open source desktop environment GNOME. The application comes bundled with GNOME and is in later releases known as Image Viewer. However, Eye of GNOME can be used in any Linux operating system or distribution. It also share many similarities with another official image viewer for GNOME called gThumb