For example, you can do a git remote --verbose and git will show all the remotes you have on your project, git branch will show all the branches an
Following up on Sagi Illtus' answer, add the following alias to your ~/.gitconfig
[alias]
ls-subtrees = !"git log | grep git-subtree-dir | awk '{ print $2 }'"
Then you can git ls-subtrees from the root of your repository to show all subtree paths:
$> cd /path/to/repository
$> git ls-subtrees
some/subtree/dir