Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
CodeMyUI - Handpicked code snippets you can use in your web projects
GitZip - Download or create a download link for a GitHub project folder/sub-folder or file.
Codespace - A beautiful cross-platform code snippet manager
GitHub Hovercard - GitHub Hovercard provides neat hovercards for GitHub.
Creative Tim - Awesome Bootstrap freebies and templates to build better websites