servers help (amongst other features) by adding access control, displaying the contents of a Git repository via the web interfaces, and managing multiple repositories. Already existing Git repositories can be cloned and shared to be used by others as a centralized repo. It can also be accessed via remote shell just by having the Git software installed and allowing a user to log in. Git servers typically listen on TCP port 9418. Open source Hosting the Git server using the Git Binary. Gerrit, a Git server configurable to support code reviews and provide access via ssh, an integrated Apache MINA or OpenSSH, or an integrated Jetty web server. Gerrit provides integration for LDAP, Active Directory, OpenID, OAuth, Kerberos/GSSAPI, X509 https client certificates. With Gerrit 3.0 all configurations will be stored as Git repositories, and no database is required to run. Gerrit has a pull-request feature implemented in its core but lacks a GUI for it. Phabricator, a spin-off from Facebook. As Facebook primarily uses Mercurial, Git support is not as prominent. RhodeCode Community Edition (CE), supporting Git, Mercurial and Subversion with an AGPLv3 license. Kallithea, supporting both Git and Mercurial, developed in Python with GPL license. External projects like gitolite, which provide scripts on top of Git software to provide fine-grained access control. There are several other FLOSS solutions for self-hosting, including Gogs and Gitea, a fork of Gogs, both developed in Go language with MIT license. Git server as a service There are many offerings of Git repositories as a service. The most popular are GitHub, SourceForge, Bitbucket and GitLab. Adoption The Eclipse Foundation reported in its annual community survey that as of May 2014, Git is now the most widely used source-code management tool, with 42.9% of professional software developers reporting that they use Git as their primary source-control system compared with 36.3% in 2013, 32% in 2012; or for Git responses excluding use of GitHub: 33.3% in 2014, 30.3% in 2013, 27.6% in 2012 and 12.8% in 2011. Open-source directory Black Duck Open Hub reports a similar uptake among open-source projects. Stack Overflow has included version control in their annual developer survey in 2015 (16,694 responses), 2017 (30,730 responses), 2018 (74,298 responses) and 2022 (71,379 reponses). Git was the overwhelming favorite of responding developers in these surveys, reporting as high as 93.9% in 2022. Version control systems used by responding developers: The UK IT jobs website itjobswatch.co.uk