Looking at the number of pull requests for any given project I guess is a very good indicator. Looking at the number of closed jQuery pull requests yields a pre

Looking at the number of pull requests for any given project I guess is a very good indicator. Looking at the number of closed jQuery pull requests yields a pretty high number: https://github.com/jquery/jquery/pulls?direction=desc&page=1&sort=created&state=closed https://github.com/jquery/jquery/pulls?direction=desc&pa... — there's no doubt in my mind that putting Bootstrap on Github is the reason it succeeded as well (look at the number of pull requests, forks and issues raised. Looking at Rails you can see there have been thousands of successfully merged pull requests: https://github.com/rails/rails/pulls?direction=desc&page=1&sort=created&state=closed https://github.com/rails/rails/pulls?direction=desc&page... — would that number of bugs and features have been addressed if it weren't on Github? I could go on with lists of more high activity repositories, but I think it's more than obvious Github has been a blessing to a lot of open source projects and undoubtedly helped them become more successful and stable (how much is a somewhat subjective and un-measurable thing).