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Seamless Texture Generator is simple but handy tool to use within Unity Editor.
If you often fight with making textures seamless by hand or sending them back and forth to your graphic designers, then you can forget about struggling with that.
Seamless Texture Generator will loop your textures so you can tile them and it will be much less noticeable. With a bunch of the parameters in the clean window you can adjust the target result with a quick preview.