Hue - Unlimited design for startups to enterprises
Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
Design Wizard - Online graphic design tool that enables users to create and share brilliant visual content within minutes.
GitZip - Download or create a download link for a GitHub project folder/sub-folder or file.
Artboard Studio - Online graphic design app mainly focused on product mockups.
GitHub Hovercard - GitHub Hovercard provides neat hovercards for GitHub.