The best alternative to GIMP is Krita, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to GIMP and many of them are so hopefully you can find a suitable replacement. Other interesting alternatives to GIMP are Photopea, darktable, PixiEditor and LazPaint.
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.
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.
Open source non-destructive RAW editor and virtual darkroom with zoomable lighttable, database-driven organization, HDR and EXR support, floating-point workflow, batch exporting, and advanced editing for photography and scientific imaging across platforms.
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.
Raster & vector graphic editor with many tools and filters, written in Lazarus. Portable, 32bit & 64bit versions, ORA format & 16384x16384 image support. In app 3D import & rendering.
miniPaint is free online image editor using HTML5. Edit, adjust your images, add effects online in your browser without installing anything. You can use the Electron based version of the editor if you like.
PhotoFiltre 7 is a complete image retouching program. It allows you to do simple or advanced adjustments to an image and apply a vast range of filters on it. It is simple and intuitive to use, and has an easy learning curve.
Conversion software for Mac and PC that automatically corrects optical flaws, extends dynamic range, and seamlessly removes digital noise from images.
Flame Painter is a unique paint program that lets you create original artworks with flame brushes.
Open source image editor with non-destructive editing, 110+ filters, adjustment and text layers, support for smart objects and adjustment layers, cross-platform compatibility, and layer-based editing for flexible image composition.
Pocket Paint is a paint editor that, among others, allows setting parts of pictures to transparent and zooming up to pixel level.
GPS (aka Gimp Paint Studio) is a collection of brushes, patterns, color gradients, accompanying tool presets and dynamics. Tool presets are a simply saved tool options, highly useful feature of the GIMP.
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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.