To use this tool you'll need to create a personal Github account and enter your user name and a personal access token in the respective fields of this tool.

Scrape Github to find the usernames contributing source code to a repository, and the ammount of contributions they have made.
The scraper identifies the 500 most prolific contributors. Extra contributions, if any, are accumulated under the username 'Anonymous'.

Export options are a CSV file, to read with your spreadsheet application, and GEXF, to import the data into Gephi.

This scrapers results are identical to the list produced by the following API call:

https://developer.github.com/v3/repos/#list-contributors