1.most repos are svn client/server
2.git is repo type ,it adds more features
3.git-svn is a git wrapper over svn client,the server is still svn server
4.trac is a utility that builds features over the svn source base
5.trac git-plugin build features over the trac server
setup
http://www.kernel.org/pub/software/scm/git/docs/howto/setup-git-server-over-http.txt
using git client
http://markmcb.com/2008/10/18/3-reasons-to-switch-to-git-from-subversion/
