Deck - A multi-timeline viewer for GitHub repository events
GitZip - Download or create a download link for a GitHub project folder/sub-folder or file.
GitKraken Timelines - Communicate major project milestones and deadlines for free
Refined GitHub - Browser extension that makes GitHub cleaner & more powerful
ChronoFlo Timeline Maker - Create beautiful interactive timelines that you can share online
GitHub Hovercard - GitHub Hovercard provides neat hovercards for GitHub.