One of the most popular alternatives to Paint.NET is GIMP, which is free and open source. Other popular alternatives are Krita, Adobe Photoshop, Affinity and Photopea. Image Editors like Paint.NET are a crowded field, with more than 100 alternatives for Windows, Mac, the web, Linux and iPhone.
Sumo Paint is a powerful image editor with a long-standing history as a fully capable Photoshop clone in the browser. Being designed for the browser, it's accessible on practically any system and loads much faster than most comparable desktop tools while still providing core...
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A fast, lightweight raster image editor for Windows. Features layers, blend modes, GPU-accelerated filters, gradients, mesh warp, brushes, selection tools, adjustments, animated GIF/APNG support, and a built-in Rhai scripting engine. Single portable executable, no install required.
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Pixia is a freeware bitmap graphics editor program for Windows, created by Isao Maruoka. It was originally designed for the anime/manga community but has also been used in other branches of art.
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Artweaver is a simple Freeware program for creative painting, i.e. Artweaver offers you all artistic effects which you need for your work.
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openCanvas, popularly abbreviated as oC, is a popular Japanese image editing program.
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You can use it to view your photographs and improve them. Showfoto is the standalone image editor of the digiKam project.
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KolourPaint is a simple painting program to quickly create raster images. It is useful as a touch-up tool and for simple image editing tasks.
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Pixeluvo is a beautifully designed photo and image editor for PC. It supports everything from simple color and contrast tweaks, cropping and resizing, to complex photo montage with multiple layers, masks and effects.
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PixaFlux is a node based image processing application. PixaFlux creates and edits images in a non destructive way, using a node graph to organize the workflow without restrictions of size, position or color mode.
Umoupen is a fully featured drawing and animation app for artists who want it all, sketching, frame-by-frame animation, storyboarding, comic/notebook features, endless raster and vector canvases, extensive import (most image types, MP4, SVG, FLA) and export (PNG, GIF, MP4)...
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