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>How to install these services to our web site ?

If you get a virtual/dedicated server you can do anything you want. With dedicated you can even put whatever OS you want on the machine.

If you don't have dedicated service then go for subversion/mantis hosting plan.

Have a look at some links (blogs & faq)

1. http://www.codinghorror.com/blog/2008/04/setting-up-subversion-on-windows.html
2. http://gstoolkit.codeplex.com/wikipage?title=SvnReverseProxy&ProjectName=gstoolkit
3. http://subversion.apache.org/faq.html
4. http://www.kernel.org/pub/software/scm/git/docs/howto/setup-git-server-over-http.txt
5. http://www.redmine.org/wiki/1/RedmineMigrate

Uhm, if it's "web-hosting", chances are you only have "web" space. I.E. you can place pages, and probably jsps, servlets, phps, asps, etc there, as well as at least a small "download" area, but anything else is a system application and those lie outside the realm of "web-hosting". Ask your provider about any possible "equivalent" services that they may (and probably do) already provide (which also includes DB services, of course), or are willing to install and make available.

Now, as stated above, if you have a "dedicated" server, virtual or not, then do what you wish, that is much more than simple "web-hosting", so I can only assume that this is not what you have.