1. GIMP is a free program for such photo retouching, image composition and image authoring. Essentially it's the closest thing to Photoshop you can get for free.
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  2. Inkscape is an Open Source vector graphics editor, with capabilities similar to Illustrator, CorelDraw, or Xara X, using the W3C standard Scalable Vector Graphics (SVG) file format.


  3. Adobe Photoshop is the commercial image editor that set the standard in creative illustration and design work with a sophisticated, layer-based workflow and robust, professional feature set.
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  4. Paint.net is a free and very capable image editing software for Windows. Great alternative to Photoshop for people that do not need all the stuff PS offers.
  5. Online photo editor, which can work with PSD, XCF and Sketch files (Photoshop, Gimp and Sketch App). Convert between PSD, XCF, JPG, PNG and many other formats.
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  6. MyPaint is a fast painting program with an emphasis on full-screen use. It lets you focus on the art instead of the program. You work on your canvas with minimum distractions, bringing up the interface only when you need it.
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  7. 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.
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  8. Pixlr® makes it easy to transform everyday images into stunning works of art. Whether you’re applying a quick fix to your photos or adding your personal touch with effects, overlays, or borders, Pixlr has everything you need to make your moments beautiful.
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  9. ImageMagick is a software suite to create, edit, and compose bitmap images. It can read, convert and write images in a variety of formats (about 100) including GIF, JPEG, JPEG-2000, PNG, PDF, PhotoCD, TIFF, and DPX.
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    • FreemiumProprietary
    • Mac
    • Windows
    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    Canva gives you everything you need to easily turn ideas into stunning designs. Create designs for Web or print: - blog graphics - presentations - Facebook covers - flyers - posters - invitations - and so much more
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  10. Pixelmator is a powerful, beautiful, and easy to use image editor. Featuring an elegant and streamlined single-window interface, it puts all the focus on the images you edit, rather than what's around them.
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  11. PicPick is an all-in-one software for software developers, graphic designers and home user. It has an intuitive interface and simple, elegant operation. After starting the software, you simply select one of the tool from the PicPick Tools trayicon menu when you want.
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  12. Vectr is a free graphics editor. Vectr is collaborative like Google Docs, and runs both in your web browser and on your desktop as a native app. With an intuitive interface, Vectr is easy to learn and use.
  13. Paint (formerly Paintbrush) is a simple, ultra-basic graphics painting program that is included with almost all versions of Microsoft Windows. It opens and saves files as Windows bitmap (24-bit, 256 color, 16 color, and monochrome, all with the .

    Discontinued

    Microsoft announced that Paint is officially deprecated with the Windows 10 Fall Creators Update. Anyway last version of the program will still be usable in Windows 10.

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  14. Glimpse is an open source image editor based on the GNU Image Manipulation Program. The goal is to experiment with new ideas and expand the use of free software.

    Discontinued

    The Glimpse editor has been discontinued

    Source: https://glimpse-editor.org/posts/a-project-on-hiatus/