A number of companies use Bitbucket - the Git solution for professional teams | Atlassian from Atlassian, which was previously known as Stash. It is a Git server, with a nice browser interface that integrates very well with other Atlassian products like Jira and Confluence.
One issue I found was converting the Bitbucket URL to something command line Git could understand. So for example, let's suppose you have a browser open and are looking at your repository and the URL is thishttps://stash.example.com/projects/myPRJ/repos/myREPO/browse, where PRJ is your project key and REPO the name of the repository in it. This translates to the following Git command:git clone https://stash.example.com/git/myPRJ/myREPO.git
Note that at the time of writing whilst a project can have many repositories it is not possible to grab all the repositories in a project with one command or pull/clone.