Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
Colorion - Curated color palettes with search and tags support
GitZip - Download or create a download link for a GitHub project folder/sub-folder or file.
Site Palette - Get the essential colours from any website
DownGit - Directly download or create download links to GitHub public folders or files.
Sketch Palettes - Sketch plugin to save and load colors into the color picker