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Pros
Pro Easy and powerful
Easy unwrapping process, lots of tools to lay out the UVs exactly the way you want.
Pro Easy installation procedure
The installation is very easy, there's an executable file which when run, makes you answer the common installation questions and after that, it's up and running.
Pro Multiple platform
UVLayout is available for Windows, Linux and Mac.
Cons
Con Outdated UI
UVLayout's user interface looks very outdated. With button styles resembling the Windows 98 style it is not very pleasing to the eye.