Snarl - Snarl is a notification system for Windows.
Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
Growl for Windows - Growl for Windows is a Windows-compatible version of https://alternativeto.
GitZip - Download or create a download link for a GitHub project folder/sub-folder or file.
Notify OSD - Canonicals on-screen-display notification agent, implementing the freedesktop.
GitHub Hovercard - GitHub Hovercard provides neat hovercards for GitHub.