As a web designer, I find websites like uiGradients.com a quite useful resource, with a massive selection of ready-made gradients (and css code for those).
This palette is a complete (01.09.2018) pack of all gradients alongside their names, hand-imported over the course of an afternoon and a few podcasts.
I don't think you can copyright colors/gradients, but the GitHub repository of the uiGradients.com website is licensed under MIT. I'll try to keep the file up to date with the website, but if there's a missing gradient or a error, please tell me about it.
Enjoy: uiGradients.com.zip
