Is it possible to list all users that contributed to a project (users that have done commits) in Git?
Any additional statistics?
I haven't got around to testing it myself yet, but this looks really nice for project statistics for a Git repository: https://github.com/visionmedia/git-extras
Check out the bin catalog to see the the different scripts.
For example, the git-count script (commit count per committer):
git shortlog -n $@ | grep "):" | sed 's|:||'