ImageMagick is an all-in-one freeware graphics software suite for creating, editing, composing, or converting images in Windows, Linux, and Mac.

Artweaver Free lets you paint creatively with the help of a vast range of painting tools so you can create sketches from photos or experiment with colors.

Lunacy is a full-fledged sketch editor. Using Lunacy, you can create new designs. It's a perfect tool for prototyping. You can add simple shape elements to your layout (such as drawing an oval, rectangle, line, or adding a bitmap) and drawing, aligning, and joining objects.

Imagine is a free image-animation viewer developed as an alternative to many other free popular viewers such as IrfanView, XnView, or FastStone Image Viewer.

Blockbench provides you with an Open Source model editor for low-poly and boxy models with pixel art textures.

G'MIC is an open and full-featured framework for image processing in Gimp, Paint.Net, and Krita.

FireAlpaca is a free paint app with simple tools and controls that let you draw an illustration quickly.

Sparkbooth is a very full-featured photobooth software capable of using webcams or DSLR cameras.

GIMP Portable is the full-featured image and photo editor bundled with a PortableApps.com launcher as a portable app so that you can edit your photos and images on the go. The latest installer is available for download here.

Darktable Portable is a photography workflow application and raw developer that aims to provide photographers with a virtual light table and darkroom. Also available for Linux/Mac as well as an installer version.

InvokeAI is an open-source AI image generation and creative toolkit that runs on Windows, macOS, and Linux.

darktable is an Open Source photography workflow application and raw developer intended to be a virtual light table and darkroom for photographers. Portable version is also available.

Alternate PicView is a user-friendly freeware program designed for viewing and manipulating images.

cPicture is a modern all-in-one software suite to support your digital picture workflow. Very easy and without a database or installation.

Krita Studio is an Open Source, powerful, all-in-one painting application geared for professional artists, VFX, and game studios.

Photo Pos Pro Photo Editor is a free photo editor offers users a wide variety of possibilities in the fields of Image Enhancing and Image Editing.

FastStone MaxView allows you to view and manipulate images quickly and efficiently, and it fully supports all major graphic formats.

Affinity by Canva seamlessly integrates the capabilities of Affinity Photo, Designer, and Publisher into a single, powerful, and free application.

Synfig Studio puts powerful 2D animation at your fingertips, allowing you to create film-quality animation right from your desktop in minimal time.

ibis Paint offers a wide range of advanced features designed to enhance your digital art creation experience, making it easier to produce stunning artwork.

LibreCAD is an Open Source 2D CAD (computer-aided drafting) application that provides an easy-to-use graphics suite for all major operating systems. LibreCAD portable is also available.

Pinta is a free, Open Source drawing/editing program modeled after Paint.NET. Its goal is to provide users with a simple yet powerful way to draw and manipulate images on Linux, Mac, and Windows.

Seamless3d is Open Source 3D modeling software for any type of artist wanting to create 3D animation.

DeepSkyStacker is geared toward astrophotographers and provides a simplified option for pre-processing images.

ImageGlass is an Open Source portable image viewer that supports many image formats and is loaded with great features.