Because they are open-source, these programs are free to download and use. There also are a ton of free resources online to use with them, such as brushes (and remember, Photoshop brushes work in the most recent versions of GIMP!), fonts and other options. Online forums offer help on everything from how to add custom brushes to troubleshooting program performance. And, who knows, if you want a new feature, you might find some enterprising software developers who are interested in making it happen.
Graphic design and image editing
GIMP - a Photoshop alternative; very powerful program, can do almost anything: www.gimp.org/
Inkscape - an Adobe Illustrator alternative for vector graphic design: inkscape.org/en/
Krita - digital painting software similar to Corel Paint: krita.org/en/
MediBang - digital painting software similar to PaintToolSAI and Krita: medibangpaint.com/en/
Paint.NET - a very simple but powerful image-editing program: www.getpaint.net/index.html
MyPaint - digital painting software similar to PaintToolSAI: mypaint.org/
Verve - a powerful digital painting program: http://www.taron.de/forum/viewtopic.php?f=4&t=4
Darktable - a RAW photo editor similar to Lightroom: www.darktable.org/
Blender - a powerful 3D imaging program: https://www.blender.org/
Sweet Home 3D - a 3D architecture program similar to Planner 5D: http://www.sweethome3d.com
Word processing and home publishing
LibreOffice Suite - includes spreadsheet and PowerPoint-like presentation software: www.libreoffice.org/
Scribus - an open-source alternative to InDesign: www.scribus.net/
ApacheOffice: word processor similar to Microsoft Word: www.openoffice.org/
Writer, the Internet Typewriter - “barebones, distraction free, typewriter style, open source words processing”: writer.bighugelabs.com/welcome
Website building & design
Try some of these: https://opensource.com/alternatives/dreamweaver
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