The Colorganize App is currently available for macOS and for Windows. Choose the *.dmg file when you're on macOS and the *.exe file when you're on Windows.
Of course you could also just use Colorganize in your browser: https://colorganize.com
With this web app you can easily organize your most needed colors and make them ready to copy with just one click. Colorganize supports to generate SCSS and LESS code for you, so you can easily embed colors into your web projects.