How to set up Git bare HTTP-available repository on IIS
Bonobo Git Server
https://bonobogitserver.com/
GitAspx - By Jeremy Skinner
https://github.com/JeremySkinner/git-dot-aspx/
https://github.com/JeremySkinner/git-dot-aspx/downloads
Install Instructions
https://www.jeremyskinner.co.uk/2010/10/19/gitaspx-0-3-available/
Git Web
https://gitweb.codeplex.com/
WebGitNET
https://github.com/otac0n/WebGitNet
Alternatively ... (non-IIS, but highly recommend, free and open-source)
Gitea (fork of Gogs): https://gitea.io
Gogs: https://gogs.io
SCM Manager allows you to easily set up revision control endpoints for Git, Hg, and SVN under the same hosting process. HTTP/HTTPS is supported along with built-in user authentication.
https://www.scm-manager.org
https://bitbucket.org/sdorra/scm-manager/
Git supposedly supports webdav, and should work with any webdav server. However, it's really slow compared to the native git protocols.
http://www.kernel.org/pub/software/scm/git/docs/howto/setup-git-server-over-http.txt