GitHub Contributions - All your GitHub contributions in one image
GitHub + Slack Integration - Full visibility into your GitHub projects right inside Slack
GitWrapped - View/Share how you contributed to Github over the years
Cryotos - #1 Maintenance Management Software
GitHub Metrics - Customize your profile with various plugins and metrics
Codacy - Automatically reviews code style, security, duplication, complexity, and coverage on every change while tracking code quality throughout your sprints.