Gitea - A painless self-hosted Git service
Sourcegraph - Sourcegraph is a free, self-hosted code search and intelligence server that helps developers find, review, understand, and debug code. Use it with any Git code host for teams from 1 to 10,000+.
Bonobo Git Server - Set up your own self hosted git server on IIS for Windows.
Atlassian Fisheye - With FishEye you can search code, visualize and report on activity and find for commits, files, revisions, or teammates across SVN, Git, Mercurial, CVS and Perforce.
Gitstack - GitStack is a free software that let you setup your own private Git server on Windows.
Text Sherlock - Provides a fast, easy to install and use search engine for text but, mostly for source code.