This article is full of alternatives to popular software on Windows and Mac, which is not available on Linux.
Alternatives:
Feel free to add software to this list in the form of a Pull Request.
http://alternativeto.net/ is a very helpful site for finding alternatives to software.
Adobe Photoshop
Description: Photoshop is Adobe’s photo editing, image creation and graphic design software. Photoshop is very helpful for creating wireframes and mockups of websites.
Alternatives:
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