Github contributions graph [closed]

There is a wonderful contributions chart that github.com came with.

Does anybody know if they use some kind of library or gem?

If it is open source, I would like to use it my project as well. It looks great!

Not exactly the same style, but I think it's done using the calendar example of D3.js.

If you do a "View Source" on GitHub's page, you'll see that they're using D3 for rendering their calendar.

A similar look is achieved by js-chart-widgets.

The Github Contributions calendar is using D3. If you inspect your network traffic you'll see the request for the JS and you can look through the source yourself.

EDIT: I've removed the source link as the CDN url is likely to change over time. It should still be locatable if you take a look with your web inspector.