The best open source alternative to Krita is GIMP. If that doesn't suit you, our users have ranked more than 100 alternatives to Krita and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Krita are MyPaint, Fossify Paint, enve and DrawPile.
Free open-source suite offering advanced photo retouching, image composition, original artwork creation, batch processing, plugin support, custom scripting, mass image format conversion, and integration with free publishing tools for comprehensive editing solutions.
MyPaint is a fast, distraction-free, and easy painting tool for digital artists. It supports graphics tablets made by Wacom, and many similar devices.
Privacy-centric digital drawing tool perfect for all skill levels. Create, customize, and share art with adjustable brushes, canvas colors, and versatile format support via PNG, JPG, and SVG without compromising your privacy—fully open-source.
Enve is a free and open-source 2D animation app. It can create both vector and raster animations and even use sound and video files. It has been created with flexibility and expandability in mind.
Drawpile is a drawing program that lets you share the canvas with other users in real time.
AzPainter is a full color painting program for Linux. It's a lightweight tool with tablet pressure support, and provides basic functions such as selection, layers, filters. you can use it for painting, image editing, or pixel art making.
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.
BSD-licensed portable photo editor for Windows featuring multi-layer editing, batch processing, macro support, real-time effect previews, advanced filters, customizable hotkeys, non-destructive tools, color-managed workflow, efficient performance, and broad file compatibility.
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.
InfiniPaint is a collaborative, infinite space, infinite zoom, canvas note-taking/drawing app. Unlike many other infinite canvas apps, although there is a specific zoom-in level limit, there is no zoom-out limit (at least up until the point your computer runs out of memory).
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Lots of people use GIMP for photo editing, and it's not the best alternative to Krita for digital drawing/painting but you can definitely use GIMP for drawing and painting and not only to edit photos.