GIMP is described as 'Free open-source suite with advanced photo retouching, composition, batch processing, plugin extensibility, custom scripting, and wide file format compatibility' and is a leading digital painting tool in the photos & graphics category. There are more than 100 alternatives to GIMP for a variety of platforms, including Windows, Mac, Web-based, iPhone and Android apps. The best GIMP alternative is Krita, which is both free and Open Source. Other great apps like GIMP are Paint.NET, Adobe Photoshop, Affinity and Photopea.
Free, open-source painting software designed by artists for artists. Offers customizable UI, 9 brush engines, color management, tablet support, non-destructive editing, and privacy features. Portable and available on major platforms, supporting seamless texture creation.
Free Windows image editor with support for layers, plugins, and special effects. Offers intuitive interface, works offline, ad-free, and portable, consuming fewer resources.
Comprehensive raster graphics editor offering advanced photo and image editing features. Supports multiple layers, masks, alpha compositing, various color models, and has limited vector graphics, 3D, and video capabilities. Extensible via plug-ins.
Unified design solution merging advanced photo, vector, and layout tools for seamless workflow, non-destructive editing, RAW support, batch processing, AI enhancements, GPU acceleration, file compatibility, cloud asset integration, and tailored workspace options.
Browser-based image editing supports PSD, XCF, Sketch formats, advanced layers, vector tools, RAW photo support, and exports in 40+ formats. Fully client-side with AI background removal, content-aware tools, and privacy as files never leave your device.
MyPaint is a fast, distraction-free, and easy painting tool for digital artists. It supports graphics tablets made by Wacom, and many similar devices.
Web-based editor with AI image generation, quick fixes, overlays, intricate lighting and texture adjustments, customizable templates, advanced filters, support for layers, high-res export, and ad-free premium features for accessible image and design editing.
Image editing software for macOS and iOS, offering nondestructive, GPU-powered editing with machine learning features, RAW support, custom brushes, and seamless macOS integration for touch-ups, painting, and creative compositions.
PhotoScape is a fun and easy photo editing software that enables you to fix and enhance photos.
Create pixel-perfect sprites, raster paintings, and scalable vector graphics with a unified open-source editor featuring frame-by-frame animation, a node-based workflow, custom shaders, procedural art tools, anti-aliased brushes, and versatile export options.
Procreate is a versatile, award-winning app for creative digital drawing and painting on iOS. It delivers a robust, professional toolset with hundreds of configurable brushes, a powerful layering system, vector graphic tools, and comprehensive design capabilities, ensuring desktop-level flexibility and power.
MediBang Paint is a lightweight software for illustration and making comic books on Windows and Mac OS.
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I disagree with most of the negative comments because you can actually do image manipulation/photo editing as well, at least the basic stuff like auto contrast, color balance, saturation, blur, sharpness, image size, canvas size and so on.