The tools on the page, or the page itself? this is the example repo graph.
And then it says this at the bottom,
#### Why authorize?
For unauthenticated requests, Github sets a requests rate limit up to [60 requests per hour](https://developer.github.com/v3/#rate-limiting). In case the number of requests to collect data is bigger than the rate limit you'll have to authenticate yourself via Github OAuth and authorize our application. After authorization your requests rate limit will be 5,000 requests per hour. Enjoy :)
Why do you think the NSA is targeting you?