Version control on local network

[Broken Stylus]

I am looking for a solid tool to provide version control separated from internet, on a local network with its own server structure. What would be the best options?
Criteria include easiness of installation, use and price.

[Christoph]

I think Sourcetree is a good option?

https://community.atlassian.com/t5/Sourcetree-questions/Sourcetree-without-external-repository/qaq-p/439807