Anecdotally, I started using git because of projects on Github I wanted to contribute to. A number of others I know where in a similar boat. Before that, we use

Anecdotally, I started using git because of projects on Github I wanted to contribute to. A number of others I know where in a similar boat. Before that, we used subversion, bazaar or mercurial. I personally am happy with having been pushed to using git and if it was winning anyway (not clear) I'm sure I would have eventually ended there anyway, but GitHub is the reason I started using it when I did.