[viraptor]

Big names using it and GitHub. There are alternatives like mercurial, fossil, darcs, etc. but GitHub basically took over the social interaction side and majority of integrations. Nothing is better enough to displace it now. (Even if you think some specific feature in another VCS is cool, it's not cool enough to replace it where git's already deployed)

You'll still find different solutions in companies that really need it though, like Google.