There is a certain repository that has been forked by many tens of users. However most of them are inactive. The ones that are still active will probably have n commits ahead of master. However when I click on fork I can see all the users that forked but I cannot select the ones that are active.
Is there a way to see who's active or who has commits ahead of master?
You can click on the Insights tab (next to Issues and Pull requests) and you will see a sidebar on the left.
Then click on Network. You will see the most active forks there.
For example: https://github.com/cyverse/clank/network